Show me where FD designate Menu Logging (in order to duck out of combat "to avoid defeat, destruction and damage.") is different to combat logging.
Either way you're ungracefully exiting to meet the same ends. How are they semantically differentiated when both the process, intention, and ends are the same?
FD, via Sandro, has designated the Menu Log a 'Graceful Exit', and Combat Log an 'Ungraceful Exit'. FD created and maintains the Menu or Timed exit. The Menu Log is created explicitly to leave the game during combat. There is no other time that a players has to wait to leave the game. Those two facts should make it plain.
Now, you show me where FD have designated the Menu/Timed Log and the Combat Log as the same thing. I am positive I have more evidence for the distinction, than you have for the equivalence.