Six people in tank tops and helmets are rollerskating while two referees look on in the background.
Two referee look on in the background to restrict players in the game.
Just because referees look upon rollerskating people doesn't mean a game is in progress or that the referees want to restrict players.
exists e1 p1 x1 x2 x3 x4 x5 x7.(n_background(x7) & exists e2 x6.(r_on(e2) & in(e2,x7) & Actor(e2,x6) & v_look(e2) & n_referee(x6) & card_eq_2(x6)) & while(e1,p1) & Actor(e1,x1) & v_rollerskate(e1) & in(x1,x2) & subset_of(x5,x2) & n_helmet(x5) & subset_of(x3,x2) & n_top(x3) & of(x3,x4) & n_tank(x4) & n_people(x1) & card_eq_6(x1))
exists p1 s1 s2 x1 x2 x3 x5.(n_game(x5) & n_background(x3) & a_topic(x1) & Topic(x1,p1) & exists e1 x4.(in(e1,x5) & Theme(e1,x4) & Actor(e1,x1) & v_restrict(e1) & n_player(x4)) & in(s2,x3) & Theme(s2,x2) & a_on(s2) & (x1 = x2) & n_look(x1) & a_referee(s1) & Theme(s1,x1) & card_eq_2(x1))