Spectators watch as a snowboarder does a trick.
The snowboarder is competing in a competition.
Doing a trick does not imply competing.
exists e1 p1 x1 x2.(exists e2 x3 x4.(Theme(e2,x4) & Actor(e2,x3) & v_do(e2) & n_trick(x4) & n_snowboarder(x3)) & as(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_thing(x2) & n_spectator(x1))
exists e1 x1 x2.(n_snowboarder(x1) & in(e1,x2) & n_competition(x2) & Actor(e1,x1) & v_compete(e1))