Parachuter in midair.
They are doing a stunt.
The fact that there is a parachuter in midair doesn't mean doing a stunt.
exists s1 x1.(ne_nam_parachuter(s1) & a_topic(s1) & in(s1,x1) & n_midair(x1))
exists e1 x1 x2.(n_thing(x1) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_stunt(x2))