the way it is taught at umpire school's is when the ball is hit the PU heads up the 3B line in case the ball gets through, in which case he would have R1 inot 3B. as the ball is nearing the fielder the PU will slow down. when the fielder securfes the ball the PU will head back either toward the plate and be on 1B line extended. pbuc uses the same concept, but changes going back down the line to cutting across the area in front of the plate and ending up a few steps up the 1B line.
CCA mechanics vary in this situation as they require the PU to make the interference call at 2B on R1 sliding in, which is flat out ridiculous, but it's how they do it.
both pbuc and cca have BU making both calls in the infield.
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