I don't think he went for a gun. He ran into a room where there was a gun. He never touched his gun is what I think.
He had one hour sleep. Maybe he had a few drinks before going to sleep or even some pot. How would you react to Ninja clad masked men with one hour sleep?
I guess it depends on the amount of time it takes to pick up and point a gun.
The autopsy will confirm if there was any pot in his system.
So far the only thing which is not disputed is that he did have 2 oz. of pot, he did run from room A to room B, and there was a gun in room B.
What is in dispute is whether he actually had the gun in his hand or was only reaching for it.