[ Mondo doesn't say anything else after what Killua says while they're trying to get out of the school, not until Killua speaks up again when they're finally outside.

The boy's sharp and Mondo can't help but rub his hand against the back of his own head. How does he even start... ]

...I wanna know what you've been through. [ A beat. ] But ya don't gotta tell me what ya don't wanna share. [ Welp, that's probably too straight-forward. If only he knows how to word better... had he been in Killua's shoes, he wouldn't have wanted to share anything. ] I just... don't think that's somethin' that just about anyone your age can do normally.