It took me more searching than I anticipated, so to save others the trouble, go to this URL: https://www.americanassociationbaseball.tv/event/1157/st-paul-saints-vs-winnipeg-goldeyes Get to about the 53-minute mark and then watch the routine throw home after a routine base hit. The throw reaches the plate quite high and the catcher is in a vulnerable position trying to reach it. All looks normal, until the very end when the runner coming in to score looks more interested in initiating contact than in hook-sliding into the plate. The ball's high, the runner surely wants to go low, and yet didn't. I don't like that aspect of the play at all. If I'm the ump I find an excuse to eject the runner. (That's probably why the job offers aren't pouring in.) But I guess you're asking why the runner is safe, and like you I need a qualified ump to parse that one. I call the runner out, FWIW. But the ump was looking, looking, looking at something at the very end of the play, so he was watching for something that evidently hadn't occurred yet - the catcher tagged the runner not once but twice and so I don't think it was a matter of dropping the ball or not. Something else was going on there. A tag to the helmet is a legal tag, right? It must be a call on the catcher blocking without the ball, and the ump was simply waiting for the runner to touch the plate; but with interference isn't the base automatically awarded? Next contestant, with your guess?