The pacing here is intentional, I think. Lyrically, Arkhangelsk introduces the second major lyrical theme on the album, and the two fast tracks that come next return frantically to the theme of the first half as the moment of reckoning draws near. That moment occurs in Iridium. I'm not going to say which themes those are, though, because people need to play with these lyrics and ideas on their own for a while. Suffice to say, this is probably the single most lyrically complex DT album to date.