Yveltal screams again and slams its claws into the stone once it shoves rocks and gets upright, dragging its body up the stone wall itself, clinging to it like some sort of massive bat in a cave. Now its tail--clawed as well--is hanging over the nearest entrance, sinking in and blocking it as well as leaving huge cracks in an already-unstable door.

It twists its head around, glaring accusingly down at Asriel, like it's his fault it's not strong enough now.