He decides not to scold her for trying to help, but makes a mental note to hug her very thoroughly later. She's all right, neither of them have drowned, but there's no way they're moving this bookshelf.

"Climb up the side," he instructs. "Get to higher ground. I'll try to see if I can get through the door!"

He can't see where the door is, and the light from the sonic isn't bright enough to tell him where to go, but he aims for roundabout where the water is coming from.