User blog comment:Silva-zoldyck/what if... they caught annie before transforming?/@comment-7418318-20130924083233/@comment-7418318-20130926092425

I even used that as an example to show that he can transform while surrounded by something, so why bring that up again? It gives me the feeling you didn't really read or at least didn't try to understand the meaning of my post.

In the tunnel there was only air above the ceiling, so the transformation could just "push" those stones above Eren away, making enough room to complete. And on top of that the stability of that ceiling was already weakened by Annie stomping two holes into the tunnel.

But what will happen if the walls and ceiling of the cell in which a shifter tries to transform are stable enough to withstand the preassure of the titan transformation?