Hmm, I read up on the law concerning 'brandishing firearms' and considering he feared possible harm and was done in self defense, it is legal to expose in that manner.
"It is a class 1 misdemeanor to hold, point or brandish a firearm, or anything that looks like a firearm, or a bb gun, if it is intentionally done in a way that causes someone to fear they may be shot or injured".
"This law does not apply to using a firearm for legitimate self defense."
So basically you have to wait for the guy to walk right up to you, whip out a knife and THEN you can whip the coat back?