Ok I'm kinda embarrassed to ask this question because I should know it but here I am. Tonight in a JV softball game there are runners on first and second with less than two outs like it should be. Batter hits a popup on the infield that reached the legal definition of popup but it was no where near any infielder and fell easily to the ground. Field ump immediately called IFF once the ball got in the air. The runners on base took off on the hit and were about halfway to the next base when the ball hit the ground. They stutter stepped back and forth without going anywhere then advanced to the next base safely.
Ok so my question is - although the ball wasn't caught in the air aren't the runners still required to tag up in order to advance? Neither runner went back to the base they started on and tagged up. In baseball / softball that is with good players this isn't even a consideration because the ball would be caught and the runners would be heading back which creates my question since none of it played out the way it should have with more experienced / talented players. I really feel dumb for asking this