Ok, so I searched a bit and couldnt find a definitive answer on this one. The scenario is as follows.
I'm playing Mohsar and my opponent is playing Cptn Caine. I put up a wall of pillars to block his line of sight and try to protect my guys and im very close to the pillars. To counter this he puts Magic bullet on two units of gun mages who shoot the structures, automatically hitting, doing no damage to the pillars but triggering magic bullet which arcs to the guys behind the wall causing a pow 12.
After looking at the spell description and the rules I couldnt find anything that says this is wrong, but nothing that really says its write. I'm not an expert on the rules yet so I'd like to confirm this because its a crazy smart move. The spell says it triggers when the model directly hits (doesnt say vs what) and that a model within 4" takes a hit (so no LOS needed I assume). Is there some targeting issue I'm missing?