premise: A motocross rider is slightly airborne on a competition circuit jump.
hypothesis: The motorcross rider is standing in quicksand.
explanation_1: One cannot be slightly airborne and standing at the same time.
explanation_2: either on a jump or standing in quicksand.
explanation_3: A rider who is airborne on a circuit jump cannot be standing in quicksand.
premise_logic: exists p1 s1 x1 x2 x3.(for(p1,s1) & r_slightly(s1) & on(s1,x3) & n_competition(x3) & Theme(s1,x1) & a_airborne(s1) & exists x4 x5.((x1 = x4) & n_jump(x4) & of(x4,x5) & n_circuit(x5)) & n_rider(x1) & of(x1,x2) & n_motocross(x2))
hypothesis_logic: exists e1 x1 x2 x3.(n_rider(x1) & of(x1,x2) & n_motorcross(x2) & in(e1,x3) & n_quicksand(x3) & Actor(e1,x1) & v_stand(e1))