A man with an arm cast films something on video while another man is looking at the camera.
A movie director films an actor.
camera  doesn't imply director
(-x)
all x1.(n_actor(x1) -> exists x2 x3 x4.(a_topic(x2) & for(x2,x1) & n_film(x2) & of(x2,x4) & n_director(x4) & of(x2,x3) & n_movie(x3)))