The snowboarder is sitting down.
The person is sitting in the snow.
The person could be sitting on a bench or chair, not in the snow.
exists e1 s1 x1.(n_snowboarder(x1) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_sit(e1))
exists e1 x1 x2.(n_snow(x2) & n_person(x1) & in(e1,x2) & Actor(e1,x1) & v_sit(e1))