premise: A skateboarder in the air straddling his upside-down skateboard.
hypothesis: A skateboarder is straddling his upside down skateboard and in the air.
explanation_1: 'Straddling his upside down skateboard and in the air,' is a way of paraphrasing 'in the air straddling his upside-down skateboard.'
explanation_2: A skateboarder is straddling his upside down skateboard and in the air is rephrasing of the original scenario.
explanation_3: A skateboarder in the air straddling his skateboard is the same as a skateboarder straddling his skateboard in the air.
premise_logic: exists e1 s1 x1 x2 x3 x4.(n_skateboard(x4) & a_upside-down(s1) & Theme(s1,x4) & of(x4,x2) & n_male(x2) & n_air(x2) & a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_straddle(e1) & (x2 = x3) & n_skateboarder(x1))
hypothesis_logic: exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(n_air(x7) & in(e2,x7) & Theme(e2,x6) & Actor(e2,x4) & v_straddle(e2) & n_upside(x6) & of(x6,x5) & n_male(x5) & n_skateboarder(x4) & down(e1,x3) & n_skateboard(x3) & Theme(e1,x2) & Actor(e1,x1) & v_straddle(e1) & n_upside(x2) & of(x2,x1) & n_male(x1) & n_skateboarder(x1))