genius-747
The the inital sound heard for any fire or smoke detected is a master warning and the CRC aural warning.
The ECAM messages you get for smoke/fire are :
There is no fire bottle that lights up in the cockpit, as there is an automatic fire extinguisher in the waste bin.
The lavatory smoke detector feeds into the smoke detection and control unit, which feeds the smoke warning to BOTH the cockpit (LAVATORY SMOKE on ECAM) and to pursar station giving a cabin warning.
It sounds like the cabin waring went off okay, they lead the hostess to the toilet to find the person smoking....
Your friend should know that a master warning in flight does not always mean an engine fire.
I am not aware of a aural alarm specific to "engine failure".