[tobell]

Sounds like you are talking about the "trombone take-away", where you contract the deltoid while releasing the infraspinatus allowing the right arm to float away from the torso. This trombone action takes place immediately after the torso starts turning, thus transferring moment from the more massive torso into the distal less massive lever (right arm). The right arm then likewise will transfer momentum to the less massive distal segment (secondary lever assembly) via the magic right forearm.