The Eldar do this twice: the first one, when they kill a cultist that was attacking the group while they tried to deactivate the bomb; the second one, when the Eldar Farseer attacks the genestealer patriarch that is about to kill Severus.
Lyle has the biggest one: when he kills the Genestealer psychic, all the cultists and Genestealers on the planet suffer a backlash that allows the defenders to win the battle.
Crapsack World: It's Warhammer 40,000 after all, but the planet of Gloaming springs to mind, where everyone but the noble class live in eternal gloom causing them to suffer from rickets and anemia and as a result are given life-shortening drugs just so they can work unceasingly for the nobles.
Heel Face Door Slam: Played for laughs in strip 34. A pair of dark eldar decide they don't like being evil torture-loving psychopaths and that they want to leave. Next panel the heroes machine-gun them.
Brianna: I don't know what they were talking about, but I bet it was evil.
Lampshade Hanging: In issue 110, Inquisitor Hunt and Lord Judge plan to make a large military operation with Imperial guardsmen and PDF forces to purge the Genestealer threat. They consider mapping out their forces with miniatures and then realize it would be an utter waste of time painting them and setting it all up.
Lock and Load Montage: Invoked by Krin, as the party goes to arm up to fight the genestealers and their cultists.
More Dakka: Krin seems fond of this. Lampshaded in one of the first strips when Severus points out Krin carries 5 guns but only has 2 hands. Although later Krin has reveals that, as he never uses his pistols, he now uses the holsters to hold snacks.
Krin: "Oh, I'm sure there won't be orks all over the thing we're after." Or "Hey, we'll be safe in here." What about "This BBQ sauce is bound to conceal our scent from those sabrehounds"? That did NOT end well. Lyle: Actually, I think that last one was you, Krin. Krin: Oh yeah! Fun times!
"Shut Up" Kiss: when Severus won't stop speaking while traveling to the Imperial Command post, Ish decides to shut him up with a kiss. Leads to Post-Kiss Catatonia for Severus.
Sinister Silhouettes: One has appeared in strip #130, apparently saving Severus from a Cultist. They turn out to be Eldar, who are in a mission to protect Severus and his companions, as the Farseer states their survival is important to the Eldar schemes.