Guns are useful in regards to their effect on fairy because there is iron in their making, it should be mentioned, many of the older fae regard things like guns and electricity, as human magic, but the guards and their captains are the least likely to do this, sense they are often called upon to deal with the mortal world.  It is rare that guns are brought into the faery mounds also.<br/><br/>Keith/Cadeyrn is powerful enough in his own right, and ancient, but as captain of the guard, he views the matter as one of knowing human weapons, and any weapon really, well enough to be good with them.