Erfworld 119, page 107

[ishnar]

Of course, this is a game-liek world, so...

*rolls loyalty* Up, Wanda only had a 20% chance to remain loyal to Banhamer. She is now disloyal. Let's see what she does. *rolls on results table* Betreyal, nasty.

My point is, if you try to do you duty, but due to circumstance are unable to fulfill that duty, you did not betray anyone.

If it is your duty to save the president, but all you have time for is to be a body shield, but the bullet goes through you and kills the president anyway, you didn't betray the president, even if you survive and he does not.