premise: A man is on a skateboard jumping from a short ledge onto the sidewalk.
hypothesis: The man is wearing knee pads.
explanation_1: Skateboarders don't necessarily need to be wearing knee pads.
explanation_2: Some people skateboard without wearing knee pads.
explanation_3: Just because the man is on a skateboard does not mean that he was wearing knee pads.
premise_logic: exists p1 x1 x5.(n_sidewalk(x5) & exists e1 s1 x2 x3 x4.(on(x1,x2) & onto(e1,x5) & from(e1,x4) & n_ledge(x4) & a_short(s1) & Theme(s1,x4) & Actor(e1,x3) & v_jump(e1) & (x2 = x3) & n_skateboard(x2)) & n_man(x1))
hypothesis_logic: exists e1 x1 x2 x3.(n_man(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_pad(x2) & of(x2,x3) & n_knee(x3))