Secondly for round one if this really went as you described it, you RDMed him. You must ask Swiftz why he called the KOS if the reason he gave was invalid you may then kill him. Some valid and invalid KOS reasons are in the rules
here.
As far as what happened 2 rounds later, it is most possible that he was KOSed for t-baiting and you either joined the gunfight, or the person that called it was killed and found to be a traitor.