[Jammin]

Edit: Ignore this post since my brain is small

No need for the logs since others confirm the story.
Yeah looks to me like bryanbrr issued you a slay for killing a person whose KOS was cancelled. You were then attacked for having killed that player and defended yourself, but the situation was sparked by you killing dan.
Even if dan deserved getting RDMd (for resigning D': ) the kill sparked a small RDM chain. Thus I think you were rightly slain for sparking the RDM chain, even if you didn't try to be malicious in the RDM.
Everyone received slays from time to time for unintentional RDM. I got slayed myself 2 weeks ago for falling off a ladder, because I landed on someone else and killed them via goomba stomp.
Don't confuse slays with bans or gags (which are generally handed out due to malicious actions). I don't think your RDM of dan was malicious, but I think a slay was the right call.