premise: During calf roping a cowboy calls off his horse.
hypothesis: A first time roper falls off his horse.
explanation_1: It is not implied that the cowboy is a first time roper.
explanation_2: If the cowboy calls his horse, its impossible to fall off his horse.
explanation_3: Because a cowboy falls off his horse does not mean that he is a first time roper.
premise_logic: exists e2 e1 s1 x1 x2 x3 x4.(during(e2,x4) & n_calf(x4) & a_off(s1) & Manner(e2,s1) & Theme(e2,x3) & Actor(e2,e1) & v_call(e2) & n_horse(x3) & of(x3,x1) & n_male(x1) & Theme(e1,x2) & Actor(e1,x1) & v_rope(e1) & n_cowboy(x2) & n_thing(x1))
hypothesis_logic: exists e1 s1 s2 x1 x2 x3.(a_off(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x1) & v_fall(e1) & n_horse(x3) & of(x3,x1) & n_male(x1) & n_roper(x1) & of(x1,x2) & n_time(x2) & a_first(s1) & Theme(s1,x1))