I think the police needs to be called immediately when the abuse begins again. If you can hear the abuse or see it, then you could be an eyewitness in the situation. If you were seeing just someone out on the street committing an assault, wouldn't you call the police? This is not a tricky situation at all. This man belongs in jail.
Many states now have changed their domestic abuse laws. The wife no longer has to be the one who presses charges and she can no longer drop the charges if there has been obvious abuse, such as injuries.
I was abused and beaten by my former husband who was a JW. The elders knew about it and did nothing to help me. I'm sure my neighbors heard my cries and screams, but nobody was there to help me.
Cynthia