I'm no ref and I know I've argued both sides of this situation with refs before. What you don't see in the video and what was clear from the floor is that Nitcher's hands were locked around Plott's left leg. Like I said, I'm no ref, but when passing judgment as to whether this was the right call or not, Nitcher's situation on bottom has to be considered (whether it is a determining factor or not is up for debate). I wonder if Plott would have got his left hand behind Nitcher's left shoulder, would that have made the difference in the call???
BTW... I was real glad I didn't have to make the call on this one.