Can I Make this Call?

[tmp44]

In the era of "getting it right," can I make this call?

FED varsity. Top of the 5th, Visiting Team down 4-3. They have an R2 with 0 outs. B1 lays down a bunt down the 1st base line that is fairly close to the line. I'm PU and come out of the box quickly for a potential very close fair/foul call. F1 fields the ball in fair territory and tags BR. From the angle I had by coming up the line to make the fair/foul call, F1 made a successful tag, and I immeidately called BR out on the tag. Visiting HC argued the call with me, although he eventually accepted my explanation.

Looking back I realize that I probably "stepped on the toes" of my partner. Making the tag call was basically a reaction 1) seeing the tag occur and 2) knowing that I had a better angle and closer distance than my partner in the C. Should I still have not made any call though? Or can the PU make the call in this situation?