let me try
Sounds like, as a RHP, his right foot first moves slightly towards 3rd (the jab) for the purpose of then turning his body to the left and stepping with his left foot toward first to make the throw. This is legal since, while his first move is with his pivot foot, it's to enable him to turn a bit to his left to then enable him to step to first with his left foot. (If we made him keep his right foot totally motionless, he'd screw it and his knee into the ground when trying to throw to first).
Does that help (hope I'm not off base here, no pun intended)?
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