Here's a team at MIT developing a way for human beings to control drones by using hand gestures (derived from the hand signals used by flight crews on carriers).
So, the idea is that if a drone (or one of the drones in a swarm) has line of sight on you, you could control the swarm using simple hand gestures.
ID target. Attack/Kill. Retreat. Encircle. Immobilize. Drive back. Land. Refuel. Station Keep.
There was a good movie recently that used this idea called "Real Steel." Fun, worth watching.