You didn't say DB did it. You only said you saw the kill. My considerations were:Why would I say I saw DB night kill then vote you?
-Swiss is Town and saw DB makes the kill -> Swiss claims vs. DB.
-Swiss is scum and fakes his claim -> Swiss claims vs. me
-Swiss is Town and fakes his claim -> Swiss claims vs. me
So if you had voted DB, you are probably Town. If you were mafia or dumb Town, you would fake claim vs. me.