premise: A guy on a skateboard, jumping off some steps.
hypothesis: a guy with a skateboard making a jump for the first time
explanation_1: It is unknown whether the skateboarder is jumping for the first time.
explanation_2: Just because the guy is jumping does not mean it is first time.
explanation_3: All jumps are not first time jumps.
premise_logic: exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(x1,x2) & a_off(s1) & Manner(e1,s1) & Theme(e1,x4) & Actor(e1,x3) & v_jump(e1) & n_step(x4) & (x2 = x3) & n_skateboard(x2) & n_guy(x1))
hypothesis_logic: exists e1 s1 x1 x2 x3 x4 x5.(n_time(x5) & a_first(s1) & Theme(s1,x5) & a_topic(x1) & with(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_make(e1) & for(x4,x5) & n_jump(x4) & (x2 = x3) & n_skateboard(x2) & n_guy(x1))