[Matt]

Originally Posted by TwoBits

That's what was called (eventually). My partner, a rookie, made a no call since "runner has a right to the base line". Defensive coach was livid, of course, even more so because his second baseman was rolling on the ground in pain. I took my partner to the side, straightened him out, and had him change the call. Offensive team was fine with the change since they knew it was the correct call.

Followup question: Same situation, this time R1 legally slides into second base but still contacting F4. Same call?

Yep, if I'm envisioning the change in scenario correctly.