Yep, that is what a brain looks like on drugs ... you know how they say you cannot reason with a drunk? Well, you cannot deal with a crack/meth addict. Their logic circuits have been disconnected from their thinking process ... seriously!
You are lucky that you or the others were not injured seriously!
Personally, after being a bondsman, I would not give an addict the opportunity to take any steps after picking up a weapon (the knife and the helmet were definitely weapons.)
Now, you have also taken steps to protect yourself and your mother after he gets released? She most definitely should file for a VPO and you should probably file for one also ... just subpoena the 911 call and play it for the judge ... you will be granted the VPO based on his verbal threats, his behavior in front of the police, and the testimony of his brandishing weapons.
This man is a threat and you will probably have to shoot him if he comes after you or your mother ... is she armed?
Please remember, you are not dealing with someone who thinks logically or rationally! This is not a matter to take lightly, and I believe you are in real, imminent danger from this individual!