A man with an arm cast films something on video while another man is looking at the camera.
A man in an arm cast doesn't have a camera to videotape anything on.
He could not film something if he doesn't have a camera because you need a camera to film something.
(x)
exists x1 x2 x3.(-exists e1 p1 x4.(Theme(e1,x4) & Actor(e1,x1) & v_have(e1) & Topic(x4,p1) & all x5.(n_thing(x5) -> exists e2 x6.(on(e2,x6) & n_thing(x6) & Theme(e2,x5) & Actor(e2,x4) & v_videotape(e2))) & n_camera(x4)) & in(x1,x2) & n_cast(x2) & of(x2,x3) & n_arm(x3) & n_man(x1))