They are playing ice-hockey.
Two teams are playing hockey.
You can't assume it is two teams playing hockey. They could be a group of friends playing ice-hockey.
exists e1 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_ice-hockey(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_hockey(x2) & n_team(x1) & card_eq_2(x1))