Probably a duplicate autopilot-like system that an AI controls. Flip a switch and controls revert back to the pilot. It may not even be a real switch, many planes disengage AP when you touch the controls.

I doubt AI will be doing dogfighting anytime soon, this is likely just an AI following predetermined routes and maneuvers and making the choice on how to accomplish them. The great thing about computers is that they can process inputs faster than humans.