Two snowboarders in a snowy scene.
They are surfing
Surfing is done on the water, not where it is snowy.
exists s1 x1 x2.(a_topic(x1) & in(x1,x2) & n_scene(x2) & a_snowy(s1) & Theme(s1,x2) & n_snowboarder(x1) & card_eq_2(x1))
exists e1 x1.(n_thing(x1) & Actor(e1,x1) & v_surf(e1))