While I'm not really happy with the current situation either, it's not like GMs are omniscient. I can't be bothered to look back and analyze the situation a few turns ago, but the task was probably difficult when it was given, with a low allowance for margin of error/bad RNG, which made it turn impossible. I feel like we can still probably still eke something out anyhow. But maybe I'm just being too hopeful here.
It was pretty easy to misinterpret the objectives, though. The small text does say that we have to kill all enemies, and that it applies to all objectives, which means that it applies even if we kill/follow Bonefaz... but I don't think it was easy to realize the complete ramifications of that at the time, especially since nobody was watching the axeman hang back each turn. It would have been nice if it was clearer (dunno how) or removed (to do it now would seem like giving in to players' demands though), but it wasn't as if we knew there would be this misunderstanding now.
And while I guess you could blame everything on Siegfried hitting the door, eh. It probably seemed like an inconsequential decision at the time, and I think we probably lose something in terms of activity/enthusiasm/whatever from people waiting on others to command them due to the fear of getting things wrong sometimes a little more than we should.
Edit:
I went and checked, and it was last turn that the objectives/turn limits were established. It seemed a while ago to me for some reason. Siegfried bonked the door long before then, so the objectives didn't seem like a direct consequence of his attack (unless the turn counter was hidden and counting down from then on - but that would be lacking in transparency).