Look, I could be walking slightly wrong and you'd probably get on my ass about it. It's not that. ...It's... hm. How do I put this... when I was learning how to be a doctor from my mentor, it was strict. There is always a rule of proper exchange. So, I suppose, I like to give as good as I get; if you're going to worry about me, then I'm keen to do a bit in return.

[It's a roundabout way of saying that he is legitimately concerned for Kaveh, but such is the way of Daan having been too practiced in protecting his heart of glass.]

...But he's important to you nonetheless. What could this argument possibly be that's keeping the two of you from speaking to each other?