"Oh yes!" He brightened at that and pulled out a couple of slides and he hums.

"I need a drop on this piece of plastic here. It's called a slide." He pulled out his knife and pricked his own finger and dripped it onto one of the slides. He puts another piece of plastic on it to press the blood between the two plastic rectangles.

"Have you got a knife or something?" He hadn't made a bone needle yet, so the knife had to do. He was avoiding sharing one though, if at all possible.