Christine is an alter (she is 14) that is really aggresive and protective. Once there was a huge mess inside because Judit (another teen alter) forced Chris (Christine's brother, afraid alter who's 13) to smoke a stale cigarette and Christine started cutting the body because she wanted to kill Judit.
She has also hit classmates for no reason and apparently people think "I" (we) am a dangerous person.
I found out that when someone told her not to do something (e.g. "Why do you hit me?"), she understood it was wrong and never happened again, so I guess I'm kinda lucky because she hosted most impulsive behaviors and most of them are gone now (thanks to her).
I agree that acknowledging that she is protecting you can help.
Tom