At night, at the edge of the Forbidden Forest.

Harry, Ron, and Hermione were hiding behind the bush at the edge of the Forbidden Forest, glancing in the direction of the castle all the time.

Hermione said with some anxiety, "I don't think we should suspect the Professor ..."

Ron quickly said, "Hermione, we've suffered from this before, remember Professor Quirrell in the first year? Who would have thought that the timid, cowardly man actually had a Voldemort glued on the back of his head?"

"But that doesn't mean that other professors-" Hermione tried to argue the facts and defend the professor she admired.

"Think about Lockhart, he may not be a dark wizard, but he's definitely not considered a qualified professor, Harry, you forget you acted as a vampire in your Defence Against the Dark Arts class?"

Harry thought for a moment, and suddenly his stomach turned a little.

So Harry whispered to her, "We're not suspicious, we're just curious to see what he's doing in the Forbidden Forest. That would also rule out our suspicion on him, and we could even ask Professor Hap for help."

Hermione stopped talking.

The three of them hid in the brush, the November night had a touch of coolness in it, and a thin mist added an extra layer of chill to that.

Ron stiffened a little from the cold, and he said shakily, "Maybe, he won't come tonight, why don't we go back first?"

" Let's just wait a little longer," Harry said patiently.

After a while longer, it was nearing midnight.

A tall figure came out of the castle.

"Someone's coming, it's Professor Hap." The trio perked up, after all, they hadn't waited in vain.

At the other end -

Felix left the castle and headed in the direction of the Forbidden Forest.

A cool breeze blew against his face at night, a very pleasant feeling.

He reached the edge of the Forbidden Forest and then noticed that something seemed to be watching him.

A small animal? Forbidden forest creatures?

But they shouldn't be at the edge of the Forbidden Forest.

Felix took out his wand and a dozen bright milky white dots of light flew out from the wand tip and then burst rapidly, illuminating the forbidden forest in a radius of a hundred metres.

There is nothing.

Somewhat puzzled, he followed his senses and went towards a large tree, examining it carefully.

Half a moment later, he laughed softly.

Opposite, the three youngsters, cloaked in Harry's invisibility cloak, didn't dare to breathe and looked across towards the professor with nervous faces.

Harry could even feel his legs shaking as Ron's rolling hot breath sprayed across his face.

But fortunately, the professor didn't suddenly reach out and lift their invisibility cloaks. He brushed past them and walked into the Forbidden Forest.

" Huff~huff!" The three of them took a big breath.

"Did he find out?"

"I don't think so."

"Why don't we go back." Ron backed off.

"No, let's continue." At this point, Hermione decided to stick with it instead.

So the three of them held on to an invisibility cloak and took baby steps behind the professor.

Felix wasn't going very fast, and he fiddled with his wand in his hand, a hint of curiosity flooding his mind.

The trio, main protagonists, was there a "plot" going to happen today?

There were too many flaws, misplaced footprints next to the tree, the faintest sound of breathing, and a gut feeling that gave him a hint of the trio's location.

Still, it was the smell of his assistant's shampoo that really made him recognize the trio.

This was the reason why Felix did not unmask them on the spot.

As Felix proceeded along his intended destination, he was a little surprised to find the trio still following behind him... their target is me?

Well, it might be a good opportunity to get to know the other two "protagonists".

About half an hour later, Felix came to a halt in a vacant space deep in the Forbidden Forest.

Thirty or forty metres away, Harry, Ron, and Hermione were also hiding behind a large tree, "What's he up to?"

"Shhh!"

Felix raised his wand and waved his wrist, three crimson spells struck the stones, and to the astonishment of the trio waiting outside the scene, the three stones turned into three large black dogs.

The dogs were half a person tall, and their fur was as smooth and oily as fine black velvet. The three large black dogs moved their bodies slightly, then directed their gaze at Felix, their upper limbs lowered, their teeth bared outward, their gaze filled with aggression.

"Quite the advanced transfiguration skills ... you see, they simply look like they're alive," Hermione commented in a whisper.

"I don't care about his level of transfiguration, I just want to know what he's doing in the Forbidden Forest," Ron muttered, but he too watched with rapt attention.

The next moment, however, something happened that took them by surprise; three large black dogs rushed towards Professor Hap at the same time and attacked him. They were extremely fast and broke through a distance of more than ten metres in almost the blink of an eye.

"Ah!" Hermione couldn't help but let out a scream, from her perspective, the big black dogs' fangs were less than three feet away from Professor Hap.

But instead of dodging, Felix flicked out a curse.

Hermione was anxious, even if it blocked one of the big dogs, there were two more. Harry and Ron's faces were also plastered with horror, especially Harry's; another professor dead in front of him in a year's time?

However, they had all apparently forgotten that all three big dogs had been transfigured by this professor.

In a second's time, the situation on the field changed abruptly.

Felix's figure disappeared abruptly, leaving a cloud of black smoke in place, and the next instant his figure appeared two metres away, and just as it did, a red light shot out of his wand. His figure disappeared in sync and reappeared in another corner, sending out a spell in an identical manner.

In the eyes of the three, it was as if the professor had transformed into three in an instant, casting three magic spells at the same time.

"Bang!"

"Bang!"

"Bang!"

The three big black dogs were hit by the spell in the sound speed and fell down instantly.

Under the invisibility cloak, they watched in awe.

"Oh my god, what kind of magic is this!" Ron's mouth gaped widely, his mind still recalling the scene from earlier.

Out of the black smoke, the professor's cold face appeared along with a red light, and in the blink of an eye reappeared in another place with a speed that was too dizzying to dodge or resist.

Harry was similarly wide-eyed.

And in the centre of the vacant space, Felix, who had just finished releasing his magic, shook his head, still not able to do it, off by half a metre.

That was only two jumps, if he had done it ten or more times, was he in danger of being hit by his own spell?

The reason Felix came out here was to perfect his trinity raid, which in his middle of school years he named as one of the "instant kill" techniques.

The principle is very simple: a trinity, that is, three types of the spells used at the same time, blending perfectly to create an effect where one plus one becomes far greater than three.

The speed of "Apparition", the power of "Petrificus Totalus" and, most importantly, the "Thought Acceleration" to maintain his balance and reflexes.

When combined, Felix can unleash his spell from a dozen different positions in an instant, forming a magnificent line of cross-energy that can make one man into a team.

The principle is indeed simple, but the road is extremely difficult.

The difference lies in how to improve one's reflexes and how to maintain one's balance in a split second.

At the beginning of the school year, he worked out the prototype, or branching technique, of this magic, the "Thinking Room", but it could only be used as a teaching aid. Now more than two months had passed, and he hadn't been idle in that time.

While Hermione had been practising the magic text in the Thinking Room, he had been in the Thinking Room contemplating how it could be applied in combat.

Luckily, he had gained quite a bit of insight recently.

That was why he had gone deep into the Forbidden Forest for several days in a row - escaping the anti-Apparition spell that was present in Hogwarts Castle everywhere!

"Two hops, barely acceptable." Felix was quite satisfied; after all, it could be enhanced later.

He then glanced back, his gaze fixed steadily in the direction of the trio.

"Come out."