A solid shield appeared on top of a huge wall of fire formed in between Mikan and that man- ultimately save Mikan from harm ways as Natsume rolled away with Mikan from there. Then Natsume immediately looks at Mikan. Fierce look evident on his face as he shouted,

"Do you wanna die, idiot! Have a good look at the situation before making a move!"

Perhaps due to agitation and tiredness, Natsume immediately reprimand Mikan for her rash action- in which Amy couldn't agree more.

But first thing first, Amy decided to focus on immediately creating a winged shield, blocking the incoming attack towards Amy from left and right. With a whip of her hand, the wings of the shield forcefully moves forward, pushing those 2 attackers far from her. Meanwhile, Tsubasa maintaining his control over 4 shadows with Ruka standing behind him. With this, they are locked, separated into 3 - Tsubasa with Ruka, Natsume with Mikan and Amy alone.

'I need to reduce the distance between us first...' Amy thought as she maintain a shield around her. Meanwhile, Natsume once again uses his fire Alice to fend off an attack send towards them. Then he said,

"Mikan, just stay behind me. This time... I will make sure to protect you. So... don't go disappearing on me again.." he said as he stands firmly, every inch of him stay alert to any potential threat from their surroundings. Mikan, pursed her lips, shook her head from side to side as she pull the corner of Natsume's sleeves. She replied,

"I'll protect myself... you don't need to protect me. Rather, let me... be your strength. Don't put yourself in harm ways and hurt all over again Natsume" Mikan look straight into Natsume's eyes- causing something started to stir in him. Amy just watched the pair from afar and immediately cast a shield, deflecting another attack towards them. Medusa who watch the whole interaction just mused at Amy's range of ability with her Alice.

"Never have I ever thought a shield user like you can be that useful. Shiki, Azami, Silver, your opponent just kids, how long are you going to stall time for"

'Silver?!' - Amy immediately ran towards Natsume and Mikan but was stopped in the middle by a silver-haired man- the all familiar man. Then, Shiki teleported behind Ruka causing Natsume to shout, wanting to pull Ruka away from the man.

"No! That's an illusion! It's a trap!" Mikan pointed out. Then the illusion disappear with the real Shiki then teleported behind Mikan, reach out to grab her when a solid barrier formed around her thanks to the necklace given to her by Amy, preventing Shiki from touching Mikan.

"Barrier Alice! Yuka, you-!" Medusa stands up, angered. The only barrier user here was Shiki. If a barrier appeared blocking the Shiki, then the only conclusion will be Yuka lied to him about the children's Alice.

"...it was my mistake not to check it properly" Yuka replied.

"Tch. Still useless. No matter. Silver, grab her now, what took you so long" Medusa as he changes his focus towards Silver and Amy, only to see Silver thrown away by a solid shield. Then without hesitation, Amy immediately uses her last 2 chances to teleport towards Natsume and Mikan- while Tsubasa and Ruka also immediately head towards them. Once together, she immediately cast a large dome barrier- blocking everything from all sides- with special focus on preventing teleportation.

"Tch, you all are useless!! They are just fucking kids!! ... Sigh, no matter, just continuously attack that barrier, she shouldn't be able to let it stand any longer anyway" Medusa gives out the instruction- causing all forms of attack to start to rain down on the barrier.

Amy took a deep breath, gritted through the pain as she said-

"Look, we don't have much time. Tsubasa senpai, there's a teleportation stone in my bag. Please use it to teleport us just outside this room. It should be enough to teleport all of us there. Mikan, you must lead us towards that thing we saw before we came"

"You mean the m-!"

"Don't say it! Natsume, save your strength, you will be our vanguard to pull through. Ruka and Tsubasa, keep an eye out on Medusa. He has the Alice of petrification. It will be troublesome if it hits any of us."

"Got it. How long can you last-!!" Tsubasa was about to ask as he reach towards the stone in Amy's bag when a crack started to form on Amy's barrier. Since earlier, she has continuously mend the barrier everytime it cracks so to block any alice from seeping in. But, due to her continuous use since yesterday, she almost got taken over the fatigue and the side effect of it getting stronger. Noticing she almost reaches her limit, medusa stands up as he approaches the dome.

"Hah, let me take care of this one." medusa took off his glasses, and his Alice seeps out of his eyes, directly attack Amy.

"Amy!!" a hand immediately spread out blocking the attack. It was Ruka.

"Ruka!!" they all shook as they saw his hand is now petrified and slowly start to spread. Mikan immediately panics and held Ruka hand all the while supporting him from falling down.

"No, no, no..." Mikan started to teared up. C'mon, why can't her Alice be of use right now. Will she stay useless forever?

"Why you!!!" Natsume started to form a large fire, his anger started to overcome his rational thoughts as he saw his best friend hurt by the man. A huge ball of fire immediately starts to attack Medusa, in which he swiftly avoided with Silver's teleportation.

"Senpai!" Amy shouted.

"Yes on it" - Tsubasa started to channel his Alice into the stone, ready to teleport away.

"Hey, don't you want the antidote for that fella! If you give that girl to us, we can have an equal exchange on this- what do you say?" Medusa offer, tempting them to exchange Mikan with the antidote. Mikan looks up and hesitate. If by exchanging herself could save them, then she wanted to agree to the offer when Amy said,

"Hah, don't trust him Mikan. Medusa, you who's an organization to steal from others, lied to others, harm many people and rule others in tyranny- who will believe in your words. Plus, giving away Mikan is not something either of us will agree with! Mikan- right now I'm going to give you a quick lesson so listen carefully. Can you imagine flowing water"

"F-flowing water- like a river?" Mikan asked as she started to imagine one.

"Yes, that kind of river. Imagine it to continuously flow as you place your hand on the petrified site. Let the river started to flow from Ruka's shoulder and end in his hand. Can you do it?"

"I... yes! I can" and so Mikan started to focus. Medusa hearing that just laughs. There's no way he won't. The only way to remove it afterall- required his own blood.

"That's futile, there's no way you can cure that without MY antidote" he boldly declared, arrogant on his all-around knowledge of his Alice and the limitation of Nullification Alice. At this, Amy just rolled her eyes and the shortsightedness of Medusa,

"Just shut up and watch. I will show you why there is no such thing as useless Alice- and that it can be both medicine and poison depending on that person" Amy snarkily replied. Then something shone, and the petrification that spread oh so strong earlier now only stayed at Ruka's hand. Remain benign. Mikan eyes teared up again as she excitedly said,

"I-i did it!"

"?!!" everyone was shocked. For they- the people of Z have always known how terrifying the petrification Alice was and how deadly it is.

"I know you can do it. Now then, sayonara Z. Let's never meet again. Tsubasa senpai!"

"Ready!" and in a blink of an eye, the whole group disappear.