Sherlock's face twisted - an emotion somewhere between disgust and annoyance. The fact that he did not have the knowledge necessary to survive bothered him on a very deep level. From Joan, he could at least allow himself to be ignorant, but from Howard?

He bristled, visibly.

"Oh good, ancient creatures where all our knowledge about them comes from movies and bones. Absolutely no possible way you could be horribly wrong and get us killed."