[This is curious, and also feels like some kind of attempt to be of use to him? To centre his own wants between them in some way? He's not sure there, but it feels odd.]

It does interest me, but I've realized that talking to people like that can make them feel like they need to be 'fixed'. I don't think that's a good state of mind to put people in. As I said, I am willing, but I want to aim to be better in it if that's what you'd like to do. [Supportive, rather than pushy. He does think shortcomings and limitations are worth pushing on, especially if they're causing problems for people, but he now thinks there have to be better ways to do it than what he has been doing: taking people apart before they've even consented to it or knew it was about to happen. Charles shakes his head at his own regrets there, and then glances down at their shifting icon on the map on his device to gauge their route. Not too far away.

And, as he thought, he's confused D'Artagnan with informal wording he's not a big fan of using, either.]

'Chill' is a word [...young, usually informal...frequently irreverent...] people in the city use, that means spending time together without needing to accomplish anything in particular. Fun, more or less. [Which is the un-fun way to explain that.]