[rdnewton]

I would say that the batter is not safe and needs to vacate the box in order to avoid hindering, confusing, obstructing a play at the plate. It is umpire judgement at this time and you should make a call that would nullify the obstruction. I recently had a similar play. Runners on second and third with one out. Passed ball and runners attempt to advance. Catcher retrieves the ball and throws to the pitcher who is covering. R3 slides and is called safe. R2 has at the same time rounded third and is attempting to score as well. At this time R3 is still on home plate and pitcher still has ball but is not paying attention to the play. Just prior to R2 attempting to score, R3 gets out of the way and R2 slides in to home before tag is applied. Ruling was: PU called "time" runners interference on his own teammate, R3 scores, R2 out on the interference. Situation is now no runners on base and 2 outs with a 1-0 count on the batter.