The way I look at it is if the altercation doesn't cause any commotion and hasn't been happening often, there is no reason to add drama to the situation by adding a slay. Our jobs as staff is to basically make sure the servers are running smoothly and people are having fun. So why create an issue out of something that doesn't need to be. Lemon, as an inno you have asked me to kill you before because you were going to bed. If it's in the fun of the game and nobody complains, it shouldn't be a problem.
What happened when the rules are not clearly defined is no issue of mine. You are not allowed to kill another player for any reason outside of the parameters of the game. This falls under the same category as crowbar fighting and a slay must be given.
As I agree with Diekasta on not wanting to create drama, I also agree with MangoTango and I believe you shoulden't be rdming eachother just because your friends as this causes chain RDM's if someone was to DNA scan your body.