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[rabadi]

You mean the 6th screenshot? If so, I don't think you are supposed to kill the guard. I don't remember since I played this a long time ago, but if you are at the point of saving the apothecary girl (I forget her name), then you can pass the guard by transforming yourself into Serena (or Selena? I mean that witch). If you are stuck, you can always consult a walkthrough (search for it with google), unless you really don't want to use walkthrough at all.