premise: A skateboarder glides down a railing of some stairs.
hypothesis: A skateboarder shows off a trick during a skate competition.
explanation_1: Just because the skateboarder is gliding down the stairs does not mean the skateboarder is in a skate competition.
explanation_2: The fact that a skateboarder glides down a railing doesn't imply that he shows off a trick and it is a skate competition.
explanation_3: Gliding down a railing does not indicate that a trick is being performed or that there is a competition. It also does not indicate that there are people to show off to.
premise_logic: exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_glide(e1) & of(x2,x3) & n_stair(x3) & n_railing(x2) & n_skateboarder(x1))
hypothesis_logic: exists e1 s1 s2 x1 x2 x3.(during(e1,x3) & n_competition(x3) & a_skate(s2) & Theme(s2,x3) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_show(e1) & n_trick(x2) & n_skateboarder(x1))
premise_sim: exists e1 s1 x1 x2 x3.(v_glide(e1) & of(x2,x3) & n_stair(x3) & n_skateboarder(x1) & n_railing(x2) & a_down(s1) & Theme(e1,x2) & Manner(e1,s1) & Actor(e1,x1))
hypothesis_sim: exists e1 s1 s2 x1 x2 x3.(v_show(e1) & n_trick(x2) & n_skateboarder(x1) & n_competition(x3) & during(e1,x3) & a_skate(s2) & a_off(s1) & Theme(s2,x3) & Theme(e1,x2) & Manner(e1,s1) & Actor(e1,x1))