A person rappels off a cliff face.
A rock climber is rapelling down a steep cliff.
Stating a person is rapping from a cliff does not specify the person is an actual rock climber.
exists e1 s1 x1 x2 x3.(a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_rappel(e1) & n_face(x2) & of(x2,x3) & n_cliff(x3) & n_person(x1))
exists e1 s1 s2 x1 x2 x3.(a_down(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_rapell(e1) & n_cliff(x3) & a_steep(s1) & Theme(s1,x3) & n_climber(x1) & of(x1,x2) & n_rock(x2))