Ryan, I know you have heard that it isn't good to call 911 in a non-emergency. I have done it twice. Once there was a car accident outside my window and another time there was a tire in the middle of the interstate. Both times I said this is a non-emergency but heres the situation....yada yada yada. Both times they thanked me for calling. They will not be upset if you tell them what happened. Police are there to be concerned for peoples safety. You were not in a safe situation and I would have reacted the same way. You shoot your mouth off at someone with a gun...before you get the assclo.... out of your mouth BOOM! I guess that would be the wrong choice.
Seriously give them a call and let them know exactly what happened. They will not be upset I guaranty it.