[greymule]

This is a tough one. I have called it both ways, but now if the runner is simply advancing to the next base and not purposely doing anything to interfere, there has to be contact before I call interference.

Vision blocked, heard the runner approaching, would have charged the ball harder—these are not substantial enough to warrant interference, in my opinion.

Giving the fielder the benefit of the doubt in these situations results in unfair calls. There are too many cases where the fielder shies away from the runner unnecessarily.

Of course, you HTBT.

And yes, if the pitcher tipped the ball, it definitely has to be intentional.