Handling and managing the discs while they are in the dog’s mouth, before they fall out and hit the ground is a key element of Disc Management, and I don’t think it is on many Player Judges’ radar. I don’t think it is in any rulebook (UpDog, maybe, excluded… Go Jack!), but it is a fact of Disc Management, nonetheless.
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Once you are done with your job, MOVE. Disc comes out of the hand for the flip, you should be moving. If the handler moves as soon as the job of throwing is over, the dog is late to the party and has to respond to the pressure of the handler and the handler’s movements.