The in-line skater slides down the wall.
The skater is sitting on a bench.
You could not slide down a wall on skates while sitting it is possible.
exists e1 s1 s2 x1 x2.(n_wall(x2) & n_skater(x1) & a_in-line(s1) & Theme(s1,x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1))
exists e1 x1 x2.(n_skater(x1) & on(e1,x2) & n_bench(x2) & Actor(e1,x1) & v_sit(e1))