Your stepfather needs to stay completely clear of that guy. That incident sounds so reminiscent of stories you hear told after a neighbor is killed by another.
Guy is definitely f'd up. No doubt he'd shoot your stepfather given the slightest perceived reason.
Through this process, I'd have your stepdad get a restraining order placed on the guy. Not that paper will save him, but in some states, him having a restraining order against him will preclude him from possessing firearms. Again, not saying he would abide, but if he doesn't, another reason for the cops to pick him up again.
Finally, your step dad needs to be armed and mentally and physically ready to shoot that sob the moment he breaks the restraining order and takes a step towards him. The guy has already made a death threat (pistol in face) so the fear for his safety is already there. The protective orders, imo, are just setting the table to allow your step dad or you to do what's going to need to be done in the future.
The only other solution is for your stepdad to sell and move away.
