Two men kick in the air at each other on a grassy area, while another man watches them in the background.
The two guys are martial artists and the third guy is the referee.
Just because men are kicking in the air doesn't mean that they're martial artists and someone could watch without being the referee.
exists e1 x1 x2 x6.(n_background(x6) & n_thing(x2) & n_air(x2) & all x3.(n_other(x3) -> exists p1 s1 x4.(exists e2 x5.(in(e2,x6) & Theme(e2,x2) & Actor(e2,x5) & v_watch(e2) & n_man(x5) & -(x5 = x1)) & while(e1,p1) & on(e1,x4) & n_area(x4) & a_grassy(s1) & Theme(s1,x4) & at(e1,x3))) & n_man(x1) & n_man(x1) & in(e1,x2) & Actor(e1,x1) & v_kick(e1) & card_eq_2(x1))
exists p1 p2 s1 x1 x3.(n_referee(x3) & n_guy(x1) & n_guy(x1) & a_third(s1) & Theme(s1,x1) & card_eq_2(x1) & (x1 = x3) & exists s2 x2.((x1 = x2) & n_artist(x2) & a_martial(s2) & Theme(s2,x2)))