Shouldn't Ctrl-D have the same effect as Death?
And shouldn't Death during the Tutorial mean reviving at Mugen.
The tutorial states " Notice: if you are new to the AfterWorld, we strongly recommend you to go through the introduction / tutorial part of the game.Of course, you can jump directly to the Quarantine zone (the New Urengoy city) now, but in this case you won't be able to take tutorial later and will need to read wiki and/or ask other players on how this game works and what to do.However if you decide to go through the tutorial now, you will have a chance to skip the rest of it at any moment and jump directly to the Quarantine zone."
Once you start the Tutorial - Ctrl-D takes you to NU.
You can also go there when you exit the lab (you have 2 choices: NU or Tutorial").
To my thinking everything says you have two paths, both end in one destination --> NU.
Anything else is a bug.