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PU is already in position to call this: it's the PUs runner, and the PU has responsibility for fair/foul and catch/no catch. So he/she should have all the elements right in view and would have the primary responsibility to make this call.
In the two man system, although BU is over on the 3B side of the diamond he/she has responsibility for the BR running to 1B. Sure it looks like a foul ball but it's not one yet. The ball could fall untouched and backspin in to fair ground. So BU needs to watch BR touch 1B look for possible OBS etc. With more runners on BU has even more responsibility.
Having said that, depending on the timing BU will probably sill get a good look at this and if PU vapor locks or somehow gets screened BU certainly can and should make the call.
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