[This is kind of a familiar playbook to Momo, given how he tends to be about his own problems, so that response just makes him frown a little. He's not going to force him outside if he doesn't want to be, but he doesn't want to be misinterpreted either.]

What I'm doing can wait. You're not bothering me, but you are worrying me, so I want to know if there's a way I can help out. Is there a reason you ended up coming here?

[Might as well start with that, to see if he can suggest somewhere else suitable that's not the library.]