With full court run and jump 34, generally the ball handler is dribbling at speed near the sideline. Here X2 forces the dribble towards the sideline. X3 releases from her check when the ball handler is three strides away. When X3 reaches the dribbler, X2 runs through to pick up X3's check. Because this is a two-player tactic, there is no rotation or adjustment by the other defenders.
Jump switching is most effective if combined with trapping, i.e., as an option out of 44. Here X3 would yell "Jump" to signal that X2 should jump switch rather than trap (the default).