A generally used method to combat onboard fires is by applying the ABC-approach. The crewmember that discovers the fire or smoke is acting as Attacker (firefighter), alarming another crewmember to act as Buddy (assistant) and a third crewmember shall act as Communicator.
If there are only two crewmembers, the Buddy is also the Communicator (there are also other names being used such as Firefighter, Coordinator or Runner).