A tactic i use sometimes, along with my peaking tactic i mensioned earlier, makes newbies fire off so many shots and waste bucket loads of ammo without achieving anything. A bit of verbal encouragement does work, usually something along the lines of "if you fell out a boat you couldn't hit water" or "i'm over here" will do the trick nicely. A marginal splatter across the face may ensue but when head shots don't count, who cares!