premise: A racing motorcycle rider has fallen off his bike and is sliding on the ground while another rider is driving behind.
hypothesis: The rider is wearing a helmet.
explanation_1: A racing motocycle rider doesn't necessarily imply to be wearing a helmet.
explanation_2: Fallen and sliding while another rider is driving behind does not mean that the rider was wearing a helmet.
explanation_3: Just because a racing motorcycle rider has fallen off his bike it does not mean the rider is wearing a helmet.
premise_logic: exists e1 e2 p1 x1 x2 x3 x4 x5 x6 x7 x8.(n_ground(x8) & exists e3 s1 x9.(a_behind(s1) & Manner(e3,s1) & Actor(e3,x9) & v_drive(e3) & n_rider(x9) & -(x9 = x1)) & n_rider(x1) & n_rider(x1) & while(e2,p1) & on(e2,x8) & Actor(e2,x5) & v_slide(e2) & n_rider(x5) & of(x5,x7) & n_motorcycle(x7) & of(x5,x6) & n_racing(x6) & off(e1,x4) & n_bike(x4) & of(x4,x1) & n_male(x1) & Actor(e1,x1) & v_fall(e1) & of(x1,x3) & n_motorcycle(x3) & of(x1,x2) & n_racing(x2))
hypothesis_logic: exists e1 x1 x2.(n_rider(x1) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_helmet(x2))