Given law enforcements propensity of killing innocent unarmed citizens for offenses ranging from selling single cigarettes to seatbelt violations, I somehow question your expertise on matters regarding self control and escalation of force. I also question your having survived a career in law enforcement for any amount of time if you held yourself to the same rules of engagement as you did the OP. If I were in the same situation I would have been equally concerned. The guy was simulating an act of violence with a weapon less then two minutes prior to approaching him. If that isn't a reason to elevate your awareness and assert yourself, I don't know what is.
I wuz like, sarcasm, then I was like, "huh?"