A skateboard rolling down a ramp.
A teen has fallen off the skateboard and it is rolling away.
A skateboard rolling down a ramp doesn't have to be the product of an accident. Also, rolling down a ramp and rolling away could mean different things.
exists e1 s1 x1 x2 x3.(a_topic(x1) & a_down(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_roll(e1) & n_ramp(x3) & (x1 = x2) & n_skateboard(x1))
exists e1 e2 p1 s1 x1 x2 x3.(n_thing(x3) & n_skateboard(x3) & exists s2.(Theme(s2,x2) & a_away(s2)) & Topic(e2,p1) & Actor(e2,x2) & v_roll(e2) & subset_of(x3,x2) & a_off(s1) & Manner(e1,s1) & Actor(e1,x1) & v_fall(e1) & n_teen(x1))