Listen, I don't want to get into an argument, but, what can't he be waiting to call it in that situation? Knowing the way replay works, I think you should be taught to be patient in that situation. Now, if it's a clear double leg takedown with zero question, you blow the whistle. This situation was obviously close enough that too officials chose to overturn it. I maintain that I would like to see the mat ref show patience in that situation. I'm not blaming him, I just believe it is something that can be used as a situation to learn from.