Severed foot

My wife and I were with our friends, NS and AS. For some reason we were in a hurried jog, on our way to or from something. NS burst out ahead of us, also for an unknown reason. He started limping and slowing down drastically. When we caught up to him, he was sitting. We took the shoe off of the foot he had been limping on, to reveal that his foot had been severed about halfway between the ball and heel. It was a perfectly smooth cut and I could see each of his bones in his flesh. AS told us that it had already been like that and that the doctor's tape must have just come loose.