performers are performing for an audience.
Performers leave the stage.
One cannot be actively performing and leaving the stage simultaneously.
exists e1 x1 x2.(for(e1,x2) & n_audience(x2) & Actor(e1,x1) & v_perform(e1) & n_performer(x1))
exists e1 x1 x2.(n_stage(x2) & Theme(e1,x2) & Actor(e1,x1) & v_leave(e1) & n_performer(x1))