A man about to step off the edge of a desert rock formation.
A person is on top of a rock.
To step off the edge of a rock, one would be on top of it.
exists p1 s1 x1 x2 x3.(n_edge(x3) & a_topic(x1) & Topic(s1,p1) & Actor(s1,x2) & a_about(s1) & exists e1 s2 x4 x5 x6.(a_off(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_step(e1) & of(x3,x4) & n_formation(x4) & of(x4,x6) & n_rock(x6) & of(x4,x5) & n_desert(x5)) & (x1 = x2) & n_man(x1))
exists p1 x1.(exists x2 x3.(on(x1,x2) & of(x2,x3) & n_rock(x3) & n_top(x2)) & n_person(x1))