Foul Balls and Home Runs

[Rich]

Originally posted by SAump
In this situation, the ruling should be made by the home plate umpire. It would be very diffcult for the PU to change his (or her) mind after the initial ruling, fair or foul ball. There may be some unexplained circumstances that may justify reversing the original call, but this would be a very rare situation. PU umpire should only make one call and it should be right the first time.

Assuming a 2-man crew, if the bases are empty and the ball is down the right field line, the BU is making this call. Why would you assume the PU is making this call?