premise: A man on a skateboard performs a trick in the air against the backdrop of a bright blue sky.
hypothesis: A man is riding a skateboard
explanation_1: Someone must be riding a skateboard in order to perform a trick.
explanation_2: Performs a trick in the air implies the man is riding a skateboard.
explanation_3: On a skateboard is a rephrasing of is riding a skateboard.
premise_logic: exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(n_backdrop(x5) & n_air(x4) & against(e1,x5) & of(x5,x6) & n_sky(x6) & a_blue(s2) & Theme(s2,x6) & a_bright(s1) & Theme(s1,x6) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_perform(e1) & n_trick(x3) & on(x1,x2) & n_skateboard(x2) & n_man(x1))
hypothesis_logic: exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_man(x1))