If any of us were in the stands when this play occurred we would all agree that whatever the call it was the right call. Later, at the bar (or in this forum) we might ask what would you call. I think as described the catcher was interfered with when she attempted to field a batted ball.
1) But the batter was in the batter’s box – irrelevant, the batter’s box does not protect the batter from interference (or the catcher from obstruction).
2) But the play took a long time to develop – irrelevant, time is not an element to any play (but timing is).
These are questions the coach is going to ask, “Where is my batter supposed to go?” or “How long would you like the BR to wait for the catcher to clear before attempting to advance to 1B?
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Guess what I don’t know or care. All I do know is that the batter will be called out if she interferes with the catcher while the catcher is in the act of fielding the batted ball.
Bugg