I would suspect that you have "suckered" in those against whom you wagered by using Engine x-bleed from an operating engine when starting a wing engine.
Oh come now,
Old Fella this is quite likely impossible, as...the engine bleed controls are within reach of the Flight Engineer, and...if these same folks were actually paying attention (Yes I know, sometimes a stretch
), I'm quite sure they would have noticed that another engine was operating...
It took at least 2 min. for the fog generator to cease, at which time the foghorn also stopped.
Yup, quite common at times, and yes, even from aircraft that have not been in storage, with engines 'preserved'.