premise: A skateboarder getting ready to perform on a half-tube rink where there are trees in the background.
hypothesis: Two horse chase after a man holding a carrot.
explanation_1: The subject is either a skateboarder or two horses and cannot be both at the same time.  The subject is either performing on a half-tube rink or chasing after a man and cannot do both.
explanation_2: ONE SKATEBOARDER IS NOT THE SAME AS TWO HORSES. GETTING READY TO PERFORM IS NOT THE SAME AS CHASING.
explanation_3: A man can't be a skateboarder getting ready to perform and also a man being chased holding a carrot.
premise_logic: exists e1 p1 x1 x2 x7.(n_background(x7) & a_topic(x1) & exists p2 s1.(Topic(s1,p2) & Actor(s1,x2) & a_ready(s1) & exists e2 p3 x3 x4.(on(e2,x3) & exists p4 x5 x6.((x5 = x6) & in(x6,x7) & n_tree(x6)) & where(x3,p3) & n_rink(x3) & of(x3,x4) & n_half-tube(x4) & Actor(e2,x2) & v_perform(e2))) & Topic(e1,p1) & Actor(e1,x2) & v_get(e1) & (x1 = x2) & n_skateboarder(x1))
hypothesis_logic: exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & after(x1,x3) & Theme(e1,x5) & Actor(e1,x4) & v_hold(e1) & n_carrot(x5) & (x3 = x4) & n_man(x3) & n_chase(x1) & of(x1,x2) & n_horse(x2) & card_eq_2(x1))