A man spray painting a mural
There is a man watching others spray paint
If the man is spray painting then he is not watching other spray paint.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x4) & Actor(e1,x3) & v_paint(e1) & n_mural(x4) & (x1 = x3) & n_spray(x1) & of(x1,x2) & n_man(x2))
exists p1 x1 e1 x2 x3 x4 x5.((x1 = x2) & n_spray(x2) & Time(x2,x5) & n_paint(x5) & Theme(e1,x4) & Actor(e1,x3) & v_watch(e1) & -(x4 = x2) & n_person(x2) & n_person(x4) & (x2 = x3) & n_man(x2))