As a reaction, which you use when a creature that you can touch or see within 2 meters of you attacks you, you can try to redirect the attack, provided that another creature is within 1 meter of you and within the attack’s range. The attacker must succeed on a Reflex saving throw or it must target that creature. If multiple creatures are within 1 meter of you and within the attack’s range, the attacker chooses which one to target.

You must choose to use this feature before knowing whether the attack hits or misses.