Ricochet

You turn your environment into your own weapon. Barriers and objects do not hinder your ability to strike your opponent.

Whenever your opponent is behind any object that obscures vision of them, you can use this feat in order to strike your opponent. Can only be used with projectile weapons.

However, you must have an idea of where the opponent is. 

Your attack takes a -2 to it's attack roll, and the damage roll is halved.