A man performing stunts on a snowboard.
A man is performing tricks on a snowboard while another films him.
Just because a man performing stunts on a snowboard does not mean another films him.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_snowboard(x4) & Theme(e1,x3) & Actor(e1,x2) & v_perform(e1) & n_stunt(x3) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2 x3 x4 x5.(n_film(x4) & a_he(s1) & Manner(e1,s1) & while(e1,x5) & n_film(x5) & -(x5 = x4) & on(e1,x3) & n_snowboard(x3) & Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & n_man(x1))