I would need their battlelog stat page for "Blurp-Mason and [G1] AK3NATON", the names dont come up except for Against_Empyre who is known as Back2PortlandLib in BF3 game. Nothing suspicious in their bf4 stats either.
You are referring to BF3 server right?
i do agree that wasn't normal kill however i would like to see more than one instance. The stats of this player seemed normal when I checked.
I encourage you to report again if you experience the same thing