[AtlUmpSteve]

Obstruction is the act of a defender who impedes a runner, while not in possession of the ball, and not in the act of fielding a batted ball. There is no added exception for a defender who puts himself in that position while in possession, but gives it up and has nowhere to go.

This is boilerplate obstruction. Your only decision is if the runner should be awarded 3rd or 2nd. I believe I would have awarded 2nd, unless there was no other defender between the runner and 3rd.