premise: A skateboarder getting ready to perform on a half-tube rink where there are trees in the background.
hypothesis: A skateboarder stands on top of a halfpipe about to jump down.
explanation_1: "About to jump down," is a rephrasing of, "getting ready to perform."
explanation_2: On a half-tube rink means on top of a half pipe and getting ready to perform means about to jump down.
explanation_3: A half-tube is a halfpipe.
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 p1 s1 x1 x2 x3 x4.(on(e1,x2) & of(x2,x3) & Topic(s1,p1) & Actor(s1,x4) & a_about(s1) & exists e2 s2.(a_down(s2) & Manner(e2,s2) & Actor(e2,x4) & v_jump(e2)) & (x3 = x4) & n_halfpipe(x3) & n_top(x2) & Actor(e1,x1) & v_stand(e1) & n_skateboarder(x1))