While hypocrisy is certainly a disdainful trait (and quite rampant in Avalon, sadly) there is a common misconception about it that is even more poorly thought out.
When one is a hypocrite in some area, it does not make them wrong. That is to say, if I proclaim that lying is bad, and go around lying every chance I get, THAT DOES NOT MEAN LYING IS GOOD.
For the same reason, even IF Koyen is dishonourable (and I assure thee she is not) that does not make quitting in the middle of battle any less cheating.
Written by my hand on the 2nd of Ilmarael, in the year 1038.