(all had valid reasons)
- QWERTYUIOP - therein lies the answer!
At the end of that well-known (extended

) day, it matters not whether YOU think it is part of your 'expected' performance or not. The company are entitled to view it THEIR way.
The thing a lot of people forget, and one I try to remember when 'considering' using discretion, is not how the crew are NOW, but how they would be x hours from now at the end of the extended duty.
One hears of stories of companies 'demanding' the use of discretion, and the answer there is also simple -get that in writing, as a telex/SITA message or whatever.