I think the whole thing with a man of two souls that blake mentioned was a form of foreshadowing
authors note I do not own RWBY
Jaunes POV
What did I do to blake get them to react that way why can't I remember doing that to blake. All I remember is waking up in a prison some time ago recuperating from injuries and being charged for crimes I supposedly did to blake leaving her almost dead.
I needed some time alone so I went to the bathroom and locked the door. I turned the cold water and splashed myself in the face with it and I asked myself what happened and then it went dark
Evil Jaune pov:
I am back in control now Ahh I had tons of fun with blakey
Flashback:
The weak Jaune had been feeling sick due to my attempts to control him and it just so happens that the moment I took control it had been after he apologized for bumping into blake and blake had said its alright, hey jaune are you alright you don't look so good . The moment I told blake that I am feeling fine and I asked her to help me out with my training and she said no. So while I wanted to start somewhere else I attacked her in the dark alleyway where no people were and she was shocked at how strong I was for I managed to knock her unconscious with out any injuries and I took her into the forest in a bag and no one questioned it because it was jaune. When I got to a cave in the forest I woke her up and when she asked what I was doing and I told her I was going to have fun with her because Your body is so beautiful. I am going to run my hands over your smooth pale skin, softly, so softly, so you shiver at my every touch. Your body will be mine and I will hurt it, beautifully, you will feel every caress of pain. I will hurt you and hurt you, and when you think there is no pain left I will hurt you again. I will take you far away, to pain you could never dream of. And then you will bleed for me, a trickle, a torrent, a stream, until the last drop of your life falls to the floor and I can taste it. And I will, finally, feel whole and fulfilled, through you [1]I said. and had some fun torturing her in many different ways and one of the minor things I done to her was was cut off her cat ears since she was always hiding them anyways. I abused her in every form but i got interrupted when yang, dr. bartholomew oobleck, ruby,and penny happened to pass by sheer chance and noticed what I was doing right before I got to kill blake in which I attacked me angrily in which I got injured and blanked out
End flashback
This prison won't hold me for long I will escape and I will kill all of the people who were responsible for starting with you yang.
End
[1] : quote from doctor who eith docto adventures novel EarthWorld though doctor who series does not exist in the RwBY universe and its just something that evil jaune truly feels