premise: Two men sitting on horses one wearing a cowboy hat, the other in a baseball cap, with a big tree behind them.
hypothesis: The two men are running around the corral, trying to catch the horses.
explanation_1: Sentence 1 establishes two men sitting on horses, while in sentence 2 they are running around and trying to catch the horses.
explanation_2: Two  men trying to catch the horses cannot be sitting on horses
explanation_3: Men sitting cannot be running at the same time.
premise_logic: exists e1 e2 s1 x1 x2 x3 x4 x5 x6 x7 x8 x9 x10.(n_thing(x7) & n_other(x7) & a_topic(x1) & with(e1,x10) & behind(x10,x7) & n_tree(x10) & a_big(s1) & Theme(s1,x10) & on(e1,x3) & Theme(e2,x5) & Actor(e2,x4) & v_wear(e2) & rel(x5,x7) & in(x7,x8) & n_cap(x8) & of(x8,x9) & n_baseball(x9) & n_hat(x5) & of(x5,x6) & n_cowboy(x6) & (x3 = x4) & n_horse(x3) & card_eq_1(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_man(x1) & card_eq_2(x1))
hypothesis_logic: exists e1 e2 p1 x1 x2 x3.(n_horse(x3) & n_corral(x2) & n_man(x1) & card_eq_2(x1) & for(e1,e2) & Topic(e2,p1) & Actor(e2,x1) & v_try(e2) & exists e3.(Theme(e3,x3) & Actor(e3,x1) & v_catch(e3)) & around(e1,x2) & Actor(e1,x1) & v_run(e1))