Dating all the way back to my days on The Tick comics, I’ve always liked tying the end of one scene into the beginning of the next. It could be the repetition of a certain word, a similar composition, or a line of dialogue in one scene working in a different context in the next scene. In this particular instance, it’s the simple word repetition of Cember shouting “We’re dead!” following the last panel of the previous page, in which Hamron vows to keep after the Brimia until they’re all dead.
In another project, Meltdown for Image Comics, I got a bit more ambitious and used similar compositions for every transition from present day scenes to flashbacks. I think I drew the inspiration from the movie Highlander, which had some very cool transitions. I also remember that being one of things I liked most about Watchmen when I first read it.