Derek, on the other hand, is still trying to shake off the rest of the day and while he's trying to pay attention to the class, he's only catching half of it and not noticing really anything else going on. It's frustrating to be this lost in himself because Derek knows that being unaware of his surroundings makes him vulnerable but he can't make himself shake it enough to be more vigilant.

So when he hears Katniss's greeting, he startles a little and looks over sharply by reflex even though he recognizes her voice. Seeing her face settles him instantly and he relaxes visibly. "Hey," he replies and Derek returns the smile. "Did you just get here? I'm not gonna lie, I am not going to remember a word of this tomorrow...and I actually, for the first time, kind of feel bad about that, actually," he admits in a whisper so as not to disrupt the class.

"Sorry I bailed earlier, I had to finish those reports for the study; I'm turning everything in in the morning," he adds apologetically. Derek does feel kind of bad about leaving her alone up there almost all day, but his project is important for everyone and he's sure she understands. Or he'd like to think she does.