A person on a motorcyle does a stunt in the air.
A human doing a stunt
A person and a human are the same and they are performing an action or a stunt.
exists e1 x1 x2 x3 x4.(n_air(x4) & in(e1,x4) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_stunt(x3) & on(x1,x2) & n_motorcyle(x2) & n_person(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_stunt(x3) & (x1 = x2) & n_human(x1))