Mantis Wrist-lock Reversal

You can use your reaction to absorb an attackers blow, when you are hit by a melee weapon or unarmed strike, by grabbing his wrist and rolling back with it. 

When you do, the damage is reduced by 1d10 + your Dexterity modifier + monk level.

If you reduce the damage to 0, you can expend 1 Ki point to make a counter attack, against the creature who just attacked you, as part of the same reaction.

the counter attack is in the form of a Taiichi  defensive maneuver,  in which the wrist is grabbed, then while rolling back with the attack, the momentum of the attacking creature is used to throw it off balance and placed prone.