I am really sorry for what you are going through with a wife with BPD and this episode in MC. I do hope that things get better with the counseling. Whether personal or couples counseling, it takes time, and it can be painful looking at the good and bad in oneself and the relationship.
To me, it seems very encouraging that you wife went to the counseling session. My uBPDgf went to one couples session and then refused to go again, feeling that the counselor was biased and that I would just "lie" anyway.
In response to your concern about accusations escalating, unfortunately, I don't see any way of predicting whether they will or not. Have you had to deal with other threats of calling the police?
A couple of other questions:
So today in MC, that translates into me almost physically hitting or hurting her. The MC didn't ask her to elaborate and may have seen me shake my head after she told me when this happened.
Are you concerned that this will bias the counselor?
During MC we were asked if there was any physical abuse or hitting due to the anger. I said no, never. My wife said no but almost. I asked when the almost was and she said it was once in the closet in our bedroom.
I'm really at a loss in this. I admitted to any bad or ugly I had said and even apologized again in front of the Therapist. I've never raised a hand to her and in reality she has hit, pushed or thrown things at me multiple times.
I am curious as to why you said "no, never"?