One of the biggest criticisms leveled against Power Slap is that the competitors in the slap fighting league are subjecting themselves to undefended strikes to the head.
There’s no argument against that since the person absorbing the slap is standing motionless with their hands behind their back while the blow is delivered. If that person, comically called the “Defender” in the official Power Slap rules, so much as flinches to lessen the strike’s impact, they are hit with a foul, which could result in the “Striker” getting another chance to land their slap. That is if “the fouling Defender is not knocked down or out by that round’s strike.