If I pretend for a moment that I can understand a word you just said, I'd have to say your suggestion seems far less practical than the spy one. Given the visual cues from this chapter, it seems pretty obvious to me that Kakashi is stabbing Rin fully knowing that he is stabbing Rin. No tricks, no henge, he is deliberately killing her, and I can't see how that could be for any reason than her being an enemy or a threat to the mission.