premise: A mountaineer about to descend down a mountain with a blue helmet on.
hypothesis: A person starts to climb down the mountain before it gets too dark.
explanation_1: Just because a mountaineer is going to descend down the mountain does not mean that it is because it is getting to dark.
explanation_2: We have no idea it is about to get too dark, it might be early in the morning.
explanation_3: A man can climb down a mountain well before it gets too dark at other times of the day.
premise_logic: exists p1 s1 x1 x2.(a_topic(x1) & Topic(s1,p1) & Actor(s1,x2) & a_about(s1) & exists e1 s2 s3 s4 x3 x4.(a_on(s4) & Manner(e1,s4) & a_down(s3) & Manner(e1,s3) & Theme(e1,x3) & Actor(e1,x2) & v_descend(e1) & with(x3,x4) & n_helmet(x4) & a_blue(s2) & Theme(s2,x4) & n_mountain(x3)) & (x1 = x2) & n_mountaineer(x1))
hypothesis_logic: exists e1 p1 x1 x2.(n_thing(x2) & n_mountain(x2) & Topic(e1,p1) & Actor(e1,x1) & v_start(e1) & exists e2 p2 s1.(exists e3 p3.(exists s2.(r_too(s2) & Theme(s2,x2) & a_dark(s2)) & Topic(e3,p3) & Actor(e3,x2) & v_get(e3)) & before(e2,p2) & a_down(s1) & Manner(e2,s1) & Theme(e2,x2) & Actor(e2,x1) & v_climb(e2)) & n_person(x1))