A boy doing a handstand on the beach.
There is a boy watching others do handstands
A boy cannot be doing a handstand and watching others do handstand at the same time.
exists e1 x1 x2 x3 x4.(n_beach(x4) & a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & on(x3,x4) & n_handstand(x3) & (x1 = x2) & n_boy(x1))
exists e2 e1 p1 x1 x2 x3 x4 x5.(Theme(e2,x5) & Actor(e2,x1) & v_do(e2) & n_handstand(x5) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & -(x4 = x5) & n_person(x5) & n_person(x4) & (x1 = x3) & exists x6.((x2 = x6) & n_boy(x6)) & (x1 = x2))