Divided Loyalties - it's when he's stewing about the traitor in their midst after Lyta shows back up. And Delenn does her whole, "Oh, I'm going to bring up something totally inconsequential and I could have just messaged you about it instead of hunting you down in this enormous space station," thing, as she is wont to do quite a bit in S2. So cute.

Well, sometimes things cap a little less attractively than they look in motion. They are both completely adorable throughout that scene.