[He winces at her response, but he can’t think of much to do from up here; if he were to try to go down and help her, he’d be dropping the entire weight on her instead of just most of it. Perhaps scaling the shelves of a random store wasn’t the best solution to this problem?]

I’m sorry. I’ll try to stop it from toppling over. [Or at the worst, he can try to catch it if she has to let go. He doesn’t think he’d be able to protect the wood from getting damaged, but hopefully they can get out of this without either of them getting injured…] If you have to, please let go and step away. Please don’t hurt yourself.