I think calling the Shotay a slap misses the point that it is a palm strike. Having said that, if Lyger didn't execute it properly and it looks like a slap, I can see the problem.
Palm strike... pretty devastating.
Slap... takes down Tough Enough winners.
On that point, one of the worst finishers I remember as a kid was the RNR Express double dropkick. So many times, one of them would not connect with whatever jobber they threw out there and on a few occasions, neither would connect with the guy. When both guys did connect, great move, but it happened like 20% of the time. What made it worse was that they would show the ending in slow motion replay exposing the move.