13U pitcher had a balk called on him the other night. He came set, lifted his leg - his hands broke(i.e. ball came out of glove) he tapped the ball back in the glove and then threw. Similar to Jason Motte, Jake Arietta etc. I am wondering if this is truly a balk as he has been doing it for some time and this was the first time it had been called on him. Also a number of big leaguers do it but that doesn't always mean it is right as the rules enforcement at the big leagues can be different than in the youth games.
Thanks in advance.