I think the Capt was extremely fortunate to have a stewardess amongst his cabin crew team who held a CPL, that must be a very rare thing.
Calling for a pilot over the PA I would imagine would be very disturbing for the pax. It is pretty disturbing when we hear the call for a medical doctor over the PA.
Perhaps the heading of this thread should be Stewardess promoted to First Officer instead of demoted. I am sure she was very useful as it would have been unlikely a 767 type rated pilot would have been amongst the pax.