"in this situation isn't that what the holding zone on the third base line is for?"
No. The PU uses that position when a ball is hit to the outfield and he may have a play at home - or at 3rd. From that "holding position" the PU can slide back if the ball comes to home. If there is no play at home he release that runner, crosses the foul line, and moves into position to make a call at 3B.
When the ball is on the infield, the PU's first priority is the B-R to 1B, then switch to 3B. But, as Mike noted, don't get too close to the line nor too far up the line. Cheat a little towards the center of the field so that you can react to a play at 3B.
WMB
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