A man is surfing down a hill of sand.
A man is entered into the sand surfing competition.
Surfing does not imply it is for a competition.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_surf(e1) & of(x2,x3) & n_sand(x3) & n_hill(x2) & n_man(x1))
exists e2 e1 x1 x2 x3.(n_competition(x2) & Actor(e2,x2) & v_surf(e2) & of(x2,x3) & n_sand(x3) & into(e1,x2) & Theme(e1,x1) & v_enter(e1) & n_man(x1))