I am partially paralyzed. My right leg is completely dead and I am in a wheelchair. A cant begin to tell you how many times I have looked down to see blood running down my leg. And I never felt a thing. Fortunately my blood clots just fine. I often have no clue how I even did it. Gashed myself against the end of a board, poked myself with a chisel, or just bashed into something moving my chair around.