As a reaction, which you use when you are hit by an attack or missed by 4 or less that you can see or when you make a Reflex saving throw, you spin gracefully away, avoiding the swing or effect. You make the roll with advantage or the attack against you is made with disadvantage. You can do so after the roll but before any effects of the roll occur.

If the roll already has advantage or disadvantage, you cannot apply another instance of advantage or disadvantage and you must use this before the roll to cancel out any advantage or disadvantage.