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Mizunos are excellent! Love mine.

I'm looking forward to my next pair being Mizunos

Oh, you NEED to get in contact with United Umpires if you're out in that neck of the woods. They are a phenomenal group run by and for umpires. They are changing the way umpire training is done, and you're right where they are there. They assign a bunch of college stuff out there (if you're looking for that), but they also do a bunch of youth stuff in the Atlanta area. Connot reccomend them enough.

I think technically, you are correct (the best kind of correct), we can never 100% know unless they tell us... But as umpires the rules require us to know. Anytime you make a ruling based on intent you could be wrong, but that's part of the job. Umpires are asked to do the impossible (be perfect) a lot. One of the reasons it's impossible is for precisely the reason you've pointed out. On this play, intent to interfere with the play actually happening is required. Running inside isn't interfering with any play until there is an actual play being made. So, until the fielder throws the ball (or, as a CYA for my statement, perhaps gets ready to throw the ball) there is no play to interfere with. If, after the throw has been made, the runner who knows where the ball is deviates to get in the way, that's interference. But if the deviation happens before, there is nothing to interfere with.

Classic example – a Base Coach interferes, especially on a pop up.