Depends on how close that unit is to the pav. If its right behind it it will get hit with any over shoots. Also a bug to watch out for is that x bows and arbs will shoot through hills. The obvious choice of hiding on a reverse slope instead of being good is in reality death. Its best to use your range units to kill melee units but you must first suppress the enemies range units first. The main exception to this is Long bows that can hit inf and cav without having to get to close.