Cyrus' Mirror Shield

A magical ward appears to protect you, any damage you would take from the coming harmful affect is halved (This is added to any other halves applied to the damage), Simultaneously, the ward mirrors the attack back toward the attacker. The attacker must make a Dexterity save or take the full amount of damage you would have taken and half on a success.

The mirrored attack only works if the incoming attack originates from the attacker. Otherwise the spell projects the attack in the direction it came from.