You leap atop your enemy just as it attacks.

Mastery is making sure even a mistake becomes an opportunity. You follow through on a miss to attack a different enemy.

When you miss with a melee weapon attack against a creature, you can use your reaction to take your momentum and target a different creature within your reach with a melee attack using the same weapon. 

You respond to an attacker’s weapon with a peerless defensive step that displays your prowess as a warrior.

When a creature makes a weapon attack against you, you can use your reaction to gain a bonus to AC equal to your proficiency bonus, possibly turning a hit into a miss.
 

With a bit of effort as an opponent strikes at you, you can knock the blow away and divert the attack.

Your victory pose spurs your allies.

Choose a weapon when you learn this combat maneuver. When you score a critical hit with this weapon, you can use your reaction to pose dramatically as you finish the strike. 

You have mastered a strike that is unmistakably your own.