During the entire drone operation, the remote pilot is responsible for operating safely and in compliance with applicable rules. This includes ensuring that the operation is monitored by an observer.
The remote pilot must instruct the observer in their role. Since it is not a requirement for the observer to hold a drone certificate, the remote pilot must ensure that the observer is familiar with the applicable rules to safely perform their duties.
The remote pilot must, at the observer's request, take necessary evasive maneuvers, land the drone, or turn it back if it is about to fly out of sight or is too close to other aircrafts.