What about this sequence. RHP "engages" with rubber with his left foot by stepping forward, pauses with hands together (ball in right hand - ball/hand in glove), then steps forward with his right foot. Could it have been interpreted that his initial step started the motion - which he then stopped. Should not matter that he just happened to start the motion with the "wrong" foot.
This would be compared to the RHP hving the ball in glove and right hand by his side stepping up with his left foot, then right. The difference here is a little nuanced, but I could see the former looking like the start of the windup.