infield fly and an interference

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Originally Posted by AtlUmpSteve

So, not two outs on the pop up. The two outs are different; if R1 stayed on the base, there would be no additional play, and no interference.

Interesting point, Steve. However, since runners can advance at their own risk on an IFF, isn't the runner interferring with the pop up due to the fact that a misplayed pop allows the runner to advance without tagging?

Golly. I'm not even sure I understand that sentence. Hopefully you will.

My point is, there is a defensive advantage to fielding an IFF and if not allowed to do so, the interference would be on the pop-up as well as a subsequent play.