This helmeted person is doing a stunt on a bicycle outdoors.
A biker is outside.
The helmeted person doing a stunt outside is a biker.
exists e1 s1 x1 x2 x3 x4.(n_person(x1) & a_helmeted(s1) & Theme(s1,x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_outdoors(x3) & of(x3,x4) & n_bicycle(x4) & n_stunt(x2))
exists s1 x1.(Theme(s1,x1) & a_outside(s1) & n_biker(x1))