We need to separate the questions,
1) what is accepted as primary responsibility
2) what could be acceptable deviations for 3rd base coverage
3) what actually happened in the OP play
and possibly ignore the pre-game in the OP and it's related semantics
1)
a) primary responsibility for LR (non-BR) is PU
b) primary responsibility for 3rd is PU, unless
- needed at HP
- first call in infield, other than HP
- BR
- see #2
2) primary responsible ump yelling "partner, take 3rd"
a) PU needed at home plate
b) BU trapped/screened away from 3rd
c) rundowns
d) etc.
3) we don't know how apparent the play at HP possibility was
a) if strongly apparent, it's PU and BU has 3rd
b) if not apparent, PU still "holding", PU has 3rd
If the terminology in the pre-game was confusing, that is another issue, possibly resolved by using "tag-ups" or some other specific. I would always think "tags" meant "tag-ups"; because a base coverage includes force-outs.
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Officiating takes more than OJT.
It's not our jobs to invent rulings to fit our personal idea of what should and should not be.
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