Difficult Situation #1: OBS on 1B Line

[tcannizzo]

R1 on 1B with no outs.
B2 bunts ball on 3B line.
F3 obstructs BR about 20 feet from home plate.

Obviously, this is PU's call, but PU is also responsible for the 3B line and whether this bunt will be fair or foul, and in doing so does not see the OBS on the 1B line.

Also, BU can and should make the call, but because moving in from the B position, trying to determine which way the play is going to go 5-6 or 5-4 also does not see the OBS.

I think this is just a case where there is always a spot on the field that doesn't have blue eyes on it.

What say ye?