[AtlUmpSteve]

I'm with Chess Ref. This doesn't meet the criteria when BU has the play at third. Per Sherlock Holmes, eliminate the impossible, what remains is possible.

BU has third when 1) B-R all the way around; nope.
BU has third when 2) PU has play at the plate on a lead runner; nope.
BU has third when 3) there is a return throw from home; nope.
BU has third when 4) PU is trapped by wild pitch or passed ball; nope.
BU has third when 5) first play by an infielder; nope (first play was pickoff attempt at second).

That leaves PU has play at third. Certainly understand BU reacting, but PU should call off and make the call.