Hi globe
you answers are very reasonable and make sense. the problem we have is that when does a duty start. at our airline with have a computerized system which didn't state that their was delay, and crew the signed-in as they believe to be their normal report time, then to discover the delay and revised report time.
as i understand, when you arrive at work and sign-in your duty period has started and therefore you are under control of the airline of operational duties.
if this is true, this crew member could not have done a duty after 13hours rest.