Couple of things, Necris... when proposing the strategy, I was writing as Jopha in the last post - D'Nim, while a decent strategist, doesn't really go into that kind of thinking - so it's a bit odd D'Nim taking the shot. (Not impossible though, but Jopha is the most likely candidate.)
The other thing is that D'Nim does NOT use bolt pistols. As far as he's concerned, they're either close enough to hit with a sword or far enough way to fall by the might of the bolter. So he doesn't normally carry a bolt pistol. (All that needs though is a change from "his bolt pistols" to "his bolter")