A snowboarder glides down a stair rail.
A sad snowboarder glides down a stair rail.
A snowboarder who glides down a rail doesn't particularly suggest sad snowboarder.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_glide(e1) & n_rail(x2) & of(x2,x3) & n_stair(x3) & n_snowboarder(x1))
exists e1 s1 s2 x1 x2 x3.(a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_glide(e1) & n_rail(x2) & of(x2,x3) & n_stair(x3) & n_snowboarder(x1) & a_sad(s1) & Theme(s1,x1))