I think Corwin had an appearance in season one - possibly "Chrysalis". Think this is the first time he gets lines, though.

Delenn - Interesting also that when the thugs demand "What are you?", she responds with a rather defensive "I am a Minbari", rather than giving her name or position... or an explanation. And that links to "Soul Mates", where it's played for laughs, but the point seems to be that she still sees herself as full or at least primarily Minbari, and persists with her old behavior. It's almost as if she feels she's made the gesture, it's done, let's move on, why are you still talking about it?, rather than thinking of it as the begining of an ongoing process.

And without explanations, or even any real further effort on her part, it's easy to see why others would see it more as an act of mockery than atonment.