[A Steel Waffle]

You did not explain you were following a KOS in the response. Your response made no sense and you did not counter any of the claims made in the report, so I slayed you because you seemed to have no reason to kill him. Death scene didn't show anything either.
Had you put in your response you were following a KOS, or told me right after I added the slay, I wouldn't slay you. But when you go out on a limb and say he was doing something "traitorous" without explanation of what he did, I kinda have to slay you because it makes it seem like you had no idea what made you kill him. 
You told me all about how you were 'following a KOS' and all a round after you were slain.