A man is skating down a rail above some steps.
A guy is skating.
Man is just a synonym for guy.
exists e1 s1 x1 x2 x3.(above(e1,x3) & n_step(x3) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_skate(e1) & n_rail(x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_skate(e1) & n_guy(x1))