Parry and Punch.
The hand that parries can be deflecting to any direction.
The punch is powered by the legs, directed by the waist, and delivered by the forearm.
Think of the elbow as the back of the fist.
Relax the shoulders and arms.
The wrist can drop a little at the end of the punch.
Parry and Punch Right:
Parry and Punch Left: