softball question

[mstrahine]

An umpire calls the infield fly rule. Can't the baserunners advance at their own risk when they notice the fielder is not going to catch the ball? Our game umpire stated that the runners needed to tag up first before advancing. I said that was only true if the fielder had caught the ball. The rule book only says "runners can advance at their own risk"

Did the umpire make a wrong call by having our runners return to their respective bases? I say he did.