For the penultimate show of the season, this is not what you would expect. Needless to say, that makes it perfect. This is one of the creepier shows in the series. It is also, as Jim points out, one of the most cost effective sets in the series.
Past meets present meets future in the pause and introspection that occurs just before all hell breaks loose in the finale. We also see some seeds of doubt planted regarding the Vorlons. Perhaps they are not quite as noble as Delenn seems to consider them? Time will tell.
Londo finally figures it out. His “associates” are far too dangerous to be around. Unfortunately he has figured it out far too late. The Narn-Centauri War reaches its final stage with some of the most poignant boom of the series. One scene in particular is just an incredible example of film-making. Yet, in spite of his repugnance of it, when the final time comes, Londo seems to embrace his fate and the evil associated with it.
As Londo grows away from the light, we begin to see the steps of G’Kar growing into the light. True, they are first steps, but we see the pettiness beginning to be stripped.
As dark as the episode is, we do have some lighter moments. One favorite character is back and we hear another mentioned. If you think this might be a clue; yes, it is.
For any other series this would be an amazing season finale. Guess what? There are still two more episodes to go and the just keep getting better.