Rule 7.13 Alert - October Edition!

Hey, we knew it was going to come up. From Tuesday night's clincher in San Francisco:
What makes this one trickier is that it's the pitcher instead of the catcher. But the principle remains the same: Leave room for the runner until you've got possession of the baseball.
But this one's easy, and once again I don't even know why any review by the fellas in New York was in order.
The umpire was right there with a great angle. I can't say exactly what he saw, but I can tell that everything we need to see is right there at the 0:50 mark of the clip: Aaron Barrett has just gloved the throw from Wilson Ramos, and there's still a perfectly straight line from Buster Posey's leading foot to the leading edge of home plate. Granted, Barrett did lower his right leg then, blocking Posey. But he's got that right, once the ball's in his glove, whether we like it or not (I don't).