A guy on a skateboard performs a trick in front of a crowd.
A skateboarder competes at a tournament.
Performs a trick does not imply competes at a tournament.
exists e1 x1 x2 x3 x4 x5.(in(e1,x4) & of(x4,x5) & n_crowd(x5) & n_front(x4) & Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_trick(x3) & on(x1,x2) & n_skateboard(x2) & n_guy(x1))
exists e1 x1 x2.(at(e1,x2) & n_tournament(x2) & Actor(e1,x1) & v_compete(e1) & n_skateboarder(x1))