Croc is that much of a threat; he's gone head-to-head with Bane before, and even a friendly brawl like that leveled an entire room.

But he's been getting in to scrapes all day, and he's fatigued. When Barnaby runs past him, he obligingly turns-- and gets trapped by the falling bookshelves.

He saw it coming, but his momentum couldn't be stopped. So here he is, weary muscles protesting the effort it takes to try and get his arms under him to push up.

"I'll rip you apart!"

Had he said that yet? Well, repetition is the key to memorization, in any way-- and Croc doesn't want to forget his threat.