FAA Regulation

Remote Pilot in Command. Commercial Balloon pilot. Designated Pilot Examiner.

Turn down the intensity of the light.  Look down at your controller screen to fly the drone and find the obstacle. Turn off the strobe light.

Denial of application for Remote Pilot, waivers, or suspension/revocation, or a civil penalty.  Jail time of up to 1 year A required checkride with the FAA

No more than three as long as the Remote PIC maintains visual line of sight. As many as he/she can handle. No more than one. 

Continue the mission, airplanes are not allowed to fly lower than 500 feet AGL unless around an airport. Give way and stay clear from the crop duster.   Continue the mission, ...

No, Part 107 requires a Remote Pilot certificate. Yes, as a Student Pilot they can. Yes, under the direct supervision of a remote Pilot in Command. 

the Remote PIC.  the controlling agency. Air Traffic Control.

Quadcopter capturing aerial imagery for crop monitoring. UAS used for motion picture filming. Model aircraft for hobby use. 

Finish the mission by paying extra attention to the surrounding. Land as soon as practical and determine if the mission can be restarted without a Visual Observer.  Continue the mission without ...

Visual observer.  Person manipulating the controls. Remote PIC.