Sherlock stared at Bush, unblinking. It wasn't pleasant, having a gun pointed at him, but he wasn't as scared as he probably should be. For one thing, the gun was an ancient pistol - inaccurate and mostly useless. He could have move out of it's optimum range in a matter of seconds. And for another, he had John.
"I was making an observation," he said. "And not one that I would consider very offensive, clearly," he added with a nod towards John.