WMB, I think we get back to the intent and definition of interference; there has to be a play with an opportunity for an out for there to be interference. I think the foul fly ball is self-explanatory; fair or foul, there has been interference with a chance to make an out.
On grounders that result in a foul ball, there never was an opportunity for an out, so there cannot be interference. If the contact occurs while the ball is fair and could have been kept fair absent the contact, we have interference. If the ball ultimately rolls fair, we have interference. But if we have contact on a (momentarily) foul ball that stays fouls, we have either a "no call" or USC.
I don't have a difference in the runner versus batter-runner scenario; just if the ball was fair or foul. Not sure I see a contradiction in the rules you cited relative to my explanation.
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