There are the AFTLS and then you have Commanders discretion to try and get the A/C and pax to destination for cases like this. Under no circumstance are you suppose to exceed the commanders discretion limit especially in this case with 3 man crew. This is the law! Why wouldn't you stop in Zbaa and change crew? If this is a new Capt what would be the outcome if they were on their 3 or bar check during command course?? We all know the answer to that one!!