Jacoby Ellsbury steal of home

So I am watching the Yankees-Red Sox game and J. D. Drew is up with the bases loaded when out of nowhere Jacoby Ellsbury steals home on a play that was not even close; a straight steal. My first thought, beyond the initial shock is "How in the heck can something like that happen?"

Looking at replays, this truly looks to be a perfect storm of events leading up to, and during the steal.

1. Even though the bases were loaded, the Yankees for some reason still put a shift on left-handed hitter, J. D. Drew. The Yankee third baseman, Angel Berroa was playing in the next area code nowhere the bag with a speedy runner there. (Girardi and/or the Yankees bench coach, where are you?). An overhead shot has Ellsbury leaving VERY early and arriving at the plate so early that he practically could have been hit by the pitch as he crossed the plate. It is hard to describe just how far away Berroa was from the bag. Twilight zone caliber weird.

2. Pettitte, a lefty with his back to third base, was working from a full wind up and never checked the runner before the pitch.

3. Posada does not stand up to ready himself for a tag and also did not appear to yell to Petitte that Ellsbury was stealing. Though he has a clear line of sight up the third base line because of the left handed batter, Posada seemed to have no concept that Ellsbury was attempting to steal.

4. Pettitte throws an off-speed pitch and Ellsbury easily beats a non-existent tag attempt by Posada who caught the pitch seemingly as he would any other and frankly appears to have not have seen the steal attempt until he had dust in his face.

Great play to watch but "Hello Yankees! How does THAT happen?

I bet that Hank was so not digging on that.