I think it is police advice not to intervene in a domestic?
I am a bit in two minds.
I think, if you do, sometimes and often both people round on the one intervening.
Plus, as someone said, it is dangerous.
You could be an additional casualty.
Plus, as someone else says, the person invariably goes back home with the abuser, at least for a while.
Yes to ringing the police as soon as possible.