While that logic holds specifically for a catcher and BR getting tangled, it is not true for ANY OTHER fielder / runner interaction. The FIELDER has right of way in fielding a batted ball. If PU feels that F2 was the fielder that should be protected in fielding this batted ball (as opposed to F1 or F5, for example), then F2 is afforded protection from a runner, including one charging from third. This sounds like interference to me.
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"Many baseball fans look upon an umpire as a sort of necessary evil to the luxury of baseball, like the odor that follows an automobile." - Hall of Fame Pitcher Christy Mathewson
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