Two emergency responders are at the scene of an incident.
The emergency responders are on the scene.
at the scene of an incident implies they are on the scene.
exists p1 x1 x2 x3.(n_scene(x3) & exists x4.(at(x1,x3) & of(x3,x4) & n_incident(x4)) & n_responder(x1) & of(x1,x2) & n_emergency(x2) & card_eq_2(x1))
exists p1 x1 x2 x3.(n_scene(x3) & n_responder(x1) & of(x1,x2) & n_emergency(x2) & on(x1,x3))