*purely Emily's interpretation of Danny's character. Emily's only seen s2 in full.*
with flack, i think that danny was able to step back, detatch from the situation. like a switch, you know? you know how when something happens that's bad and you feel like you're gonna fall apart, you take two seconds, step back, take a deep breath, and keep going like nothing had happened?
i'm not saying danny didn't feel any of what happened, or that he's not concerened about flack in anyway, i just think that if he was going to be emotional about this, he wasn't going to do it in front of everyone. think about it, *this season* the only one he's really broken down in front of was Mac. if he was going to do the same thing for don, and it was to happen in the moments they gave him, it would have either effected his job, or the way the team looked at him, and neither danny nor his pride wants that.
when he was alone though, it was probably a different story.