Whats the call?

[CecilOne]

A batted ball in flight or dribbling near the line or wherever else is not foul until it meets one of the foul ball criteria.

We have concluded in at least two other topics that the B to BR transition happens even though the batted ball does not end up being a fair batted ball; because it is not foul until the foul ball criteria apply and because it must be for the application of rules to make sense.

In this OP, the player who batted the ball, now the BR, interfered with F3 trying to field the batted ball, so the player who interfered is out, any other runner(s) return.