Much of what is written about TGM has to do with staying under the sheep’s (and LEOs) radar while being prepared to be a sheepdog if needs be.
If you haven’t heard of the concept here is a great intro:
The Grey Man is always invisible in plain sight.
The Grey Man is totally aware of his environs, his own capabilities or lack thereof, his weaponry and his levels of competence with that weaponry. He constantly strives to improve upon both his capabilities and competence. In public, he is always respectful, even to the point of obsequiousness if the situation calls for it. He always appears to be just a little confused by what is happening around him, while in reality he is alertly doing a tactical assessment.
If the Sheep, Sheepdog, and Wolves metaphor is new to you here’s the canon:
If you have no capacity for violence then you are a healthy productive citizen: a sheep. If you have a capacity for violence and no empathy for your fellow citizens, then you have defined an aggressive sociopath–a wolf. But what if you have a capacity for violence, and a deep love for your fellow citizens? Then you are a sheepdog, a warrior, someone who is walking the hero’s path. Someone who can walk into the heart of darkness, into the universal human phobia, and walk out unscathed.