To be clear and so I’m not misleading, I was neither a pilot or a sensor operator so I cannot guarantee you that there isn’t more to it than what I know. As far as I understood the drone pilot works in conjunction with a sensor operator. Because the drone pilot is an officer he is the one to fire the missile but the sensor operator controls the laser to direct the missile. I would strongly believe that there are other emergency stops available due to my experiences but at the bare minimum, the sensor operator could always direct the missile away and the sensor operator themselves can’t do anything without the pilot actually launching the missile.

Editing to add in that hellfire missiles cannot be redirected once launched.