The shooting stopped, and the security door drooped slightly on its hinges. Butler ripped the door open smartly, yanking Billy Kong inside, then jammed the door closed again.
'Hello, Billy,' he said, pinning the smaller man to the wall.
Kong was too demented to be scared. He lashed out with a series of blows, any one of which would have been fatal to a normal person. They bounced off Butler like a fly bouncing off a Tiger Tank. That's not to say they didn't hurt. Kong's trained hands felt like heated brands where they impacted. Butler's only reaction to the pain was a slight tightening around the corners of his mouth.

The Lost Colony, Chapter 12