After another attempt to destroy Kane, I was defeated after making it to the Chess battle for the first time.
A little later, I got on again, only to discover that the quest "The Final Countdown" was now directing me to speak to Avery. I did so, and was treated to the ending cutscene, which I enjoyed greatly. (Maybe it should be able to be replayed, like a puppet show?)
Anyway, this should probably be fixed before it goes live.
When it became live I notice that as well, but it made me feel really bad for doing it even though I could not defeat him anyway with most of my high level companions injured. I did not like it at all. Is it supposed to be that way?