DD, the point is this has no legal authority at this point in time. You and the cabin crew can now be held personally accountable.
Hypo now 70 lawyer going to a convention decide to sue you for damages over the missed connecting flights they had.
You can lose your house and everything - you did the thing we would all normally expect, but you need to prove you could and did have the authority at that point.
(without a doubt - if you got pushed back taxied then returned to the gate, you would have legal authority. Its stupid but it would make you legally allowed to be as insistent as you need to be. Then the problem of being personally liable is not there).
Common sense and practical play no part in court rooms.