A guy on a skateboard griding down a handrail.
A guy riding a piece of wood with wheels outdoors.
A piece of wood with wheels would be a skateboard and riding the skateboard implies you are outside.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & a_down(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_gride(e1) & n_handrail(x4) & (x2 = x3) & n_skateboard(x2) & n_guy(x1))
exists e1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & with(x3,x5) & n_outdoors(x5) & of(x5,x6) & n_wheel(x6) & of(x3,x4) & n_wood(x4) & n_piece(x3) & (x1 = x2) & n_guy(x1))