A man is rollerblading down a wall beside some steps.
A perosn is roller blading
A man rollerblading down a wall beside some steps obviously means he is roller blading.
exists e1 s1 x1 x2 x3.(beside(e1,x3) & n_step(x3) & a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_rollerblade(e1) & n_wall(x2) & n_man(x1))
exists p1 x1.(exists e1 x2 x3.((x1 = x2) & Actor(e1,x3) & v_blade(e1) & (x2 = x3) & n_roller(x2)) & n_perosn(x1))