Interference?

[CT1]

I understand your point. And I really wouldn't have a problem if baseball rules read that way. But I don't think we want to get into having one rule for a ball that might become fair, and another for a ball that will never be fair.

Don't ignore the possibility that F1/F3 might decide at the last moment to let the ball continue to roll, rather than touching it foul.

PLAY: R3, less than two outs. B1 hits a roller in foul ground up the first base line. As F1 is moving to "touch it foul", B1 collides with F1.

If you rule this a foul, then the offense has potentially gained a huge advantage, since R3 would score if the ball ends up being fair.