A young female rock climber is rappelling down the rock face.
A girl wearing a helmet is rappelling.
Just because a rock climber is rappelling down a rock face we can't assume that she is wearing a helmet.
exists e1 s1 s2 s3 x1 x2 x3.(a_down(s3) & Manner(e1,s3) & Theme(e1,x3) & Actor(e1,x1) & v_rappell(e1) & n_face(x3) & of(x3,x2) & n_rock(x2) & n_rock(x2) & n_climber(x1) & of(x1,x2) & a_female(s2) & Theme(s2,x1) & a_young(s1) & Theme(s1,x1))
exists e2 e1 x1 x2 x3.(Actor(e2,x1) & v_rappell(e2) & Theme(e1,x3) & Actor(e1,x2) & v_wear(e1) & n_helmet(x3) & (x1 = x2) & n_girl(x1))