Ampulla of Vater
Illuminator
But the outline of the blade intercepts the most external line of drops of the stain on one side, and the most external spots on the other side, doesn't it?
The spots that I "ignore" are the ones "in the middle" of the area, which I don't consider borders of the imprint, I think legitimately..
The overlapping is certainly not a definitive piece of evidence, but its shows compatibility with a theory.
Blow that picture up and look at the "bottom" line. The knife was clearly moved "upwards" after it first hit the sheet. This makes your measurements moot. The spot(s) on the "bottom" edge match up exactly with both positions of the knife. If you can't see that, I can't help you. I think it is clear as day the 2 positions of the knife.
