I think this is one of the few episodes where Delenn and Londo get any significant time together.

You're right, it doesn't happen often, which I always found slightly frustrating because the scenes they do share tend to rock. (The one where she tries to invite him to her ceremony of renewal comes to mind, Londo's vision of Delenn-the-relentless-seer-of-truths in his dream world, and of course the hug.) Also because they provide parallels and contrasts in their lives which fascinate me. Both Londo and Delenn are responsible for a ruthless war which employed genocidal tactics at times. Both Londo and Delenn, when they get a last minute chance to put an end to it by fate handing them an enemy (Delenn picks a pilot to be interrogated and it's Sinclair, G'Kar gets captured and delivered to Cartagia's court) take it, but that doesn't negate their original guilt. Both Londo and Delenn end up in an intense personal relationship with a former enemy (G'Kar and Sheridan). But Delenn's guilt is something only she and later Lennier know about; Londo's guilt is something which to a large extent most people know about, though just how deeply he was involved with Morden and how this kickstarted the Narn/Centauri war is something only Vir and, post-Dust-to-Dust, G'Kar know.