Excellent point (no pun intended). However, when I recovered my arrow, I opened each of the blades. All had blood on the part of the blade that would show when closed, but each was clean where it was folded in, that is, on the cutting surface. I' m speculating that it hit a rib and somehow didn' t penetrate enough to open. At any rate, I' m staying with the fixed blades, which have never let me down. Anyone wanna buy some Spitfires cheap?