B marks A on the backhand side for a forehand force and counts. A pivots wide to fake the around, and B shuffles across to block it.
A pivots back to the forehand side. B steps back to the forehand angle and keeps counting.
A throws the forehand to C, then runs after the disc to mark C. B moves into A's old spot to receive.
A marks C on C's backhand side and counts. C throws the forehand to B, then follows the disc to mark B.
Each player has now thrown, marked and received. Keep the rotation going for a few minutes, then switch the force to backhand.