a kayaker tumbles over.
A person tumbles over the edge of a skyscraper on a kayak.
A kayak wouldn't tumble over the edge of a skyscraper.
exists e1 s1 x1.(a_over(s1) & Manner(e1,s1) & Actor(e1,x1) & v_tumble(e1) & n_kayaker(x1))
exists e1 x1 x2 x3 x4.(n_edge(x2) & on(e1,x4) & n_kayak(x4) & over(e1,x2) & of(x2,x3) & n_skyscraper(x3) & Actor(e1,x1) & v_tumble(e1) & n_person(x1))