The Grey man kind of sounds like Jason Bourne. Here are a few more traits of the Grey man.
The Grey man walks into the ******* and counts the stalls. He notices the position of everyone's feet and stays away from anyone with a wide stance.
When in a public the Grey man observes and evaluates every movement of every person calculating the trajectory of any shot fired from an angle of not more than 2 degrees from the hand position of anyone reaching inside a pocket or purse. The Grey man does this while appearing to not be paying attention to anyone in the room. This makes eating at restaurants very time consuming for the Grey man.
The Grey man journeys alone deep into the woods on winter nights wearing only summer shorts and sandals to practice firing when his body temperature has reached the point of hypothermia. Only timber wolves have seen the Grey man practice.

Please share you Grey man stories.