What does someone do when one personality keeps trying to take over so that they can "defend" you? Like, this person that is the cause of the threat isn't actually a threat, it's just in the person's mind, but the other personality doesn't care or doesn't understand that. They specifically want to take over to hurt that person, whom you care deeply for, and make that person scared to come near (even after you quit perceiving this person as the threat).

What do you do about this?