A rock climber hangs from a ledge while others look on.
A rock climber hangs from a ledge while others look on because he might fall.
In the first sentence his rock climbing ability is not mentioned so you wouldnt know if he might fall.
exists e1 p1 x1 x2 x3.(exists e2 p2 x4.(exists s1.(Theme(s1,x4) & a_on(s1)) & Topic(e2,p2) & Actor(e2,x4) & v_look(e2) & -(x4 = x1) & n_person(x4)) & n_person(x1) & while(e1,p1) & from(e1,x3) & n_ledge(x3) & Actor(e1,x1) & v_hang(e1) & n_climber(x1) & of(x1,x2) & n_rock(x2))
exists e1 p1 x1 x2 x3.(exists e2 p2 p3 x4.(exists e3 p4.(exists e4.(Actor(e4,x1) & v_fall(e4)) & Topic(e3,p4) & Actor(e3,x1) & v_might(e3)) & because(e2,p3) & exists s1.(Theme(s1,x4) & a_on(s1)) & Topic(e2,p2) & Actor(e2,x4) & v_look(e2) & -(x4 = x1) & n_person(x4)) & n_male(x1) & n_person(x1) & while(e1,p1) & from(e1,x3) & n_ledge(x3) & Actor(e1,x1) & v_hang(e1) & n_climber(x1) & of(x1,x2) & n_rock(x2))