Tand
It might assist your argument if you were to tell us WHY a 'Mayday' call was important in this situation?
I can add to this, A mayday call, if time allows (in this and other situations) can give useful information for the crash investigators.
eg. "fire on board", "tail rotor failure", "engine failure", "run out of fuel", "jammed controls" etc…
Particularly if the aircraft is subsequently destroyed in the crash.