A motorcyclist is sporting a very colorful helmet.
The person is riding a motorcycle.
Just because a motorcyclist is sporting a very colorful helmet does not indicate that the person is riding a motorcycle.
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_sport(e1) & n_helmet(x2) & a_colorful(s1) & Theme(s1,x2) & r_very(x2) & n_motorcyclist(x1))
exists e1 x1 x2.(n_person(x1) & Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_motorcycle(x2))