A rock climber checks his rope before holding on to the next spot on the rock.
A man falls off a rock.
If the man falls off the rock he cannot be holding onto it.
(-x)
exists e1 s1 x1 x2.(a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_fall(e1) & n_rock(x2) & n_man(x1))