December 10th excerpt:

If it wasn’t for the dire circumstances they were in, Dean’s face would have been painted with fascination at the chance to work with the tools Sherlock used on his cases. As it was, he set to his task with no wasted energy, carefully mopping up every drop of blood that speckled Sam’s knife. The murky gleam of red was soon replaced by the more familiar shine.

Dean’s small size made it simple to get the blood right on the tip of the paper. It was like working with oversized construction paper, and since the blade was made for Dean’s size, he didn’t have a problem.

A small mimic of Sherlock, Dean sat back on his heels, holding up the folded paper circle for Sherlock to take, its white surface marred by the ring of drying blood.