OK, another related question. What if that runner bumps the 3rd baseman and then he catches the pop foul anyway? Only one out, or two?

JJ

The ball is dead on the INT.

Generally in baseball, when a batter hits a fly ball that's caught, it creates an out on the batter.

Not in this case.

Really? Before the INT, there was no out to be had on the batter if the ball had been caught? Why, praytell?

Rule 5-1-1e
Ball becomes dead immediately when there is interference by a runner, batter-runner, or a retired runner, the batter , or any person.

Rule 8-4-2g .....If , in the judgment of the umpire, the runner including the batter runner interferes in any way and prevents a double play anywhere, two shall be declared out...

To whom/what was this a response?

I was pointing out that in the scenario described in the OP, depending on if additional runners were on base and their actions, the umpire could conceivably award 2 outs on the play described.
For instance if a runner was on 1st and was running on the pitch. If the umpire feels he would have been a dead duck on the appeal play, based on Rule 8-4-2g he could call him out as well. All I am saying is that just because the ball is immediately dead and the runner is out, there are other things to consider on this play.

Gotcha. Thanks.

Be careful with this, in the instance of a potential infield fly, we have to determine if the ball if fair/foul on an infield fly hit down the line. OBR

In NCAA and MLB, if that interference is INTENTIONAL, both the runner AND the batter are declared out. Sort of what the FED rule says "if the interference prevents a double play"...but the majority of the time only the runner is out, and if it's a foul ball a strike is added to the count (if the batter has less than two strikes).

JJ