Obstruction

[Fritz]

Also, interference on a thrown ball requires intent as opposed to a batted ball which requires no intent.

That is why we ruled the way we did; the runner tried to get out of the way of the original play at 2B. He, thru no INTENT of his own, ended up back in the line of the throw. If he had intentionally moved back in the way, then we would have banged BR out for R1's interference. As it was, he was just standing a couple of steps onto the outfield grass mesmerized at F6's gyrations to regain control of himself and the ball and then boom, finds he is now "in the way" again.