I know it's been covered before, but I can't find the old thread

[SC Ump]

BR rounds first then stops and goes back - One stop is allowed and, if the pitcher has the ball in the circle and is not making a play, the BR must then commit to either go back to first or continue on to second. This is not an infraction.

Defense goes nuts... - They often do.

Offense makes two claims... - They shouldn't have been in the discussion. It sounds like better game control could have been in place.

I do not know if pitcher was on the rubber. - It only matters if the pitcher is in the circle. The pitching plate has nothing to do with the lookback rule. (Baseball has rubbers; softball has pitching plates.)