premise: A man looks back while laughing and walking.
hypothesis: A man is falling down on the ground.
explanation_1: A person falling down can not be walking.
explanation_2: The movement cannot be both walking and falling but must be one or the other.
explanation_3: One cannot look back while walking and simultaneously be falling down.
premise_logic: exists e2 e1 e3 p1 x1.(while(e1,e3) & Actor(e3,x1) & v_walk(e3) & while(e1,e2) & Actor(e2,x1) & v_laugh(e2) & exists s1.(Theme(s1,x1) & a_back(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_look(e1) & n_man(x1))
hypothesis_logic: exists e1 s1 x1 x2.(n_ground(x2) & on(e1,x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1) & v_fall(e1) & n_man(x1))
premise_sim: exists e2 e1 e3 p1 x1.(while(e1,e3) & while(e1,e2) & v_walk(e3) & v_look(e1) & v_laugh(e2) & n_man(x1) & exists s1.(a_back(s1) & Theme(s1,x1)) & Topic(e1,p1) & Actor(e3,x1) & Actor(e2,x1) & Actor(e1,x1))
hypothesis_sim: exists e1 s1 x1 x2.(v_fall(e1) & on(e1,x2) & n_man(x1) & n_ground(x2) & a_down(s1) & Manner(e1,s1) & Actor(e1,x1))