NCAA Mechanics Question

[hit4power]

I'm not an ump but interested in learning and value the input of the experts on the board.

Happened last week in Clermont....R1 on 3B, R2 on 2B. B3 is a lefty slapper who takes the normal run up on the first three pitches without offering or swinging. Count is 1 and 2. On the next pitch she bunts or slaps the pitch foul. PU rings her up for a foul bunt and DC comes out to argue. PU says he didn't see any wrist break so no swing, hence bunt. After more arguing PU confers with BU and then affirms the original call of foul bunt - out. DC then berates PU for going to his partner after making the call rather than before making the call.

So what's the preferred mechanic in this situation? Should PU have gone to BU to see if he saw bunt vs. slap before making the call?