A man grasps onto the rock face.
The man is trying to get his grip back.
If the man lost his grip on a rock face the man would not be on the rock face so he couldn't get his grip back.
exists e1 x1 x2 x3.(n_face(x2) & of(x2,x3) & n_rock(x3) & onto(e1,x2) & Actor(e1,x1) & v_grasp(e1) & n_man(x1))
exists e1 p1 x1 x2.(n_grip(x2) & of(x2,x1) & n_male(x1) & n_man(x1) & Topic(e1,p1) & Actor(e1,x1) & v_try(e1) & exists e2 s1.(a_back(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_get(e2)))