Covering Fire

Prereq: Weapon Focus
When an enemy attacks an ally with a melee weapon who also has this feat, a character with this talent may spend an attack of opportunity to make a ranged attack against that target, if it hits it deals no damage but gives that enemy a -2 penalty on attack rolls for one round, against any allies with this talent. If the triggering attack is an attack of opportunity, the penalty increases to a -4. This penalty does not stack with itself.