A skier flies through the air.
Nobody is flying
Nobody infers that, the skier is not flying.
exists e1 x1 x2.(n_air(x2) & through(e1,x2) & Actor(e1,x1) & v_fly(e1) & n_skier(x1))
-exists e1 x1.(Actor(e1,x1) & v_fly(e1) & n_person(x1))