A breath, closing his eyes. He chuckles but doesn't mention why he finds it amusing. Perhaps it's because he doesn't quite understand it but it's amusing for many reasons.

"That dedication I imagine is the same for Illumi and yourself, remember that." How similar you are to him, how you can't get rid of how you were raised, even if you prefer to run from it. Better to know it, embrace it, and grow from it, right?

"She's lucky to have an older brother like you-" But no comment on whether Killua's lucky to have Illumi or not.

"Really now- calm down." A chuckle, sighing and relaxing a bit as he pushes more weight on the arm propping him up. "Do I sound like I'm threatening here?"