Good thing he's has Meiling's blood in him or I might be worried

good thing there was a window there!

I think Remilia would have done the same if there was solid rock

And he'd probably been just as fine coming out the other side, too.

Mmm. I'm not quite sure about that. He's still a child, after all, he's not as rough as Meiling...

Proof is: he can't control the JAAAAOOOOO power.

He got thrown across Gensoukyou by Yukari and still managed to run back.
He'll be fine