I believe AS12 will have a different answer, but I struggle mightily with this situation.
I believe by rule you can get INT as it is the runners responsibility to avoid the fielder making a play on a batted ball, but I also know that if a runner ONLY does what he’s supposed to do, which is not get doubled up and is just standing on the bag, I could coach every fielder to get INT every single time a ball is hit by just running into a stationary runner.
Now, if the runner is RETURNING to the base, he should avoid the fielder, but if he is back at the bag and was just standing there, and F5 just runs into him, I’m not making that INT call.
As we say, "this one is where you get to earn your game fee".
The rule tells us that the runner may not hinder, impede, or confuse the opponent making a play on a batted ball. We also cannot ignore the fact that the runner, if he vacates his position on the base, puts himself in jeopardy of being put out..... So where do we draw the line?
For me, and for the NFHS, we are going to look at it this way... Did the runner make any accommodation for the fielder, while keeping himself reasonably safe from not being put out? If yes, then we have nothing. If no, we have interference..... If the ball is coming down directly on the base, the runner gets more leeway than if the ball will come down 30 feet from the base (runner has time to vacate and safely return)
Naturally, if we feel the contact was intentional, then we always protect the fielder.