You have mastered techniques to take advantage of every drop in any enemy's guard, gaining the following benefits:
- Whenever you hit a creature with an [reaction]opportunity attack[/reaction], its speed drops to 0 for the rest of the turn. This stops any movement they may have been taking.
- Creatures within your reach provoke [reaction]opportunity attack[/reaction] even if they took the Disengage action.
- When a creature within your reach makes an attack against a target other than you (and that target doesn't have this feat), you can use your reaction to make a melee weapon attack against the attacking creature.