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Richard65 I have had to intervene to stop my sister in law from stabbing soon to be ex between the shoulder blades with a knife the day after their brother's funeral.
All he did was to tap her wrist on the counter to get her to drop the knife. She went outside and really hit her arm against a wall to make it bruise up so that they had something to show the police to get soon to be ex arrested (she was seen doing that - and I witnessed soon to be ex disarm her).
The police conveniently had no interest in recording on the statements that she had a knife in her hand.
I also had to grab a iron poker off her on another occasion before she could hit the brother who died with it... He had terminal throat cancer at the time.