A person rides a four-wheeler in the air.
A person jumped his four-wheeler.
Not all people who ride a four-wheeler in the air will jump from them. It cannot be presumed the the person jumped from his vehicle.
exists e1 x1 x2 x3.(n_air(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_four-wheeler(x2) & n_person(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_four-wheeler(x2) & of(x2,x1) & n_male(x1) & n_person(x1))