A contortionist is doing a move on stage for people.
This is what happens when you buy a bending robot.
A robot has nothing to do with a contortionist.
exists e1 x1 x2 x3 x4.(for(e1,x4) & n_people(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_stage(x3) & n_move(x2) & n_contortionist(x1))
exists p1 x1.(n_person(x1) & n_thing(x1) & exists e1 p2 x2.(n_thing(x2) & (x1 = x2) & exists e3 e2 x3.(Theme(e3,x3) & Actor(e3,x1) & v_buy(e3) & n_robot(x3) & Actor(e2,x3) & v_bend(e2)) & when(e1,p2) & Actor(e1,x2) & v_happen(e1)))