QUESTION: Rounding 1B

[tgranillo]

Just starting my first year of umping softball and baseball, so bear with me. My first read of the "in the circle" rule and runners leaving base leads me to conclude that on a WALK in softball, the runner may not round 1B toward 2B if the pitcher and catcher remain in position, in the catcher's box and in the pitching circle. At the 11/12 yo level, in fact, said runner should be called out for leaving base early. RIGHT or WRONG? And a rule reference would be nice too. Thanks. -t.