If F3 blocks the runner's access to the base without the ball, he's obstructed him unless the tag is applied before contact. We wouldn't allow the runner to push F3 off the base and interfere. If the pick off throw drew F3 I to the path of the runner, then I would not have obstruction.
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Coach Paul
www.cmbua.org
Board Certified Umpire /
Baseball Instructor / Coach
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