What does this dream mean?

So me and my sister were standing at the bus stop and my friend came up to us. Then, all of a sudden, she was beheaded but still alive. So then we're in this apartment hiding from the cops and my beheaded friend was sitting on the couch watching TV and she had no head. Me and my sister had guns and blocking the door holding the cops back. And I had nothing to do with the beheading with my friend. It was so weird!