I kill idiots or unobservant players, or players that a can't avoid but killing cause they see me or try to attract attention to me. I will normally camp in a pretty obvious location near the main road/tracks along the coast (Normally near Cap Glova because of its highly traversed path between Cherno and Electro) and just watch people. I normally won't kill a freshly spawned newbie that just has their flashlight out, cause they don't have a chance to fight back, but if they are acting stupid or running in circles or run right in front of the bush in crouched next to... they get shot... and normally die. I have an Mk 48 Mod 0 and it doesn't like to let people live very often... :P