Turn 28: No, this game didn't die a silent dead!
Somehow, Killer captured the aztec capital on turn 3 or so. How, I really don't know. I guess he started the game with a stack of conquistadores. It does mean that I'm fucked though.
Back on the war in Europe topic: we agreed on "defensive wars only". That's worth completely nothing, so we agreed on "razing only and no resettling".