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B should keep their hips facing away from the thrower during the turn, and turn off the outside foot; in this scenario, B would turn off their left foot. This is to replicate a real game scenario where B is actively trying to clear downfield but is prevented from doing so by D2; the wrinkle is a reaction to that.
A can lead the receiver as a slight lead pass as well; this will make continuation easier
Use this drill to practice:
A handler, A, has the disc in the middle of the field, marked by D1. A cutter, B, stands 5-10m downfield, slightly towards the open side, guarded by D2.