premise: A couple is eating outside at a table and he is pointing at something.
hypothesis: The man is pointing at a purse snatcher.
explanation_1: A person who is outside pointing is not necessarily pointing at a purse snatcher.
explanation_2: man pointing at something doesn't imply that man is pointing at a purse snatcher.
explanation_3: A couple need not have a man in it, it could be a couple of women or men.  Also, there are many things to be pointed at besides a purse snatcher.
premise_logic: exists e2 e1 s1 x1 x2 x3.(at(e2,x3) & n_thing(x3) & Actor(e2,x1) & v_point(e2) & n_male(x1) & at(e1,x2) & n_table(x2) & a_outside(s1) & Manner(e1,s1) & Actor(e1,x1) & v_eat(e1) & n_couple(x1))
hypothesis_logic: exists e1 x1 x2 x3.(n_man(x1) & at(e1,x2) & n_snatcher(x2) & of(x2,x3) & n_purse(x3) & Actor(e1,x1) & v_point(e1))
premise_sim: exists e2 e1 s1 x1 x2 x3.(v_point(e2) & v_eat(e1) & n_thing(x3) & n_table(x2) & n_male(x1) & n_couple(x1) & at(e2,x3) & at(e1,x2) & a_outside(s1) & Manner(e1,s1) & Actor(e2,x1) & Actor(e1,x1))
hypothesis_sim: exists e1 x1 x2 x3.(v_point(e1) & of(x2,x3) & n_snatcher(x2) & n_purse(x3) & n_man(x1) & at(e1,x2) & Actor(e1,x1))