What most naturally follows?

How to perform heel wrestling moves 
A closed-fist punch is illegal in wrestling, so is a heel maneuver. 
The same goes for a head-butt or backhanded slap. 
The main reason that many people believe these moves are legal, is that they are deemed legal enough that the referee will not disqualify the person doing the move, merely tell them not to do it again.
A basic heel maneuver, yet also one of the most dangerous if performed incorrectly. Basically, kick through the bottom of the opponent.