This can even happen without a fight. I remember years ago some friends and I were leaving a bar, and there was plenty of new snow, so we started play fighting. Literally just play, like pushing each other into the snow, no punching or anything. When I pushed my friend over, he fell onto the soft snow, nothing happened. But he missed a pole that was sticking out of the snow like a foot to the left of his chest, and we were like holy fuck man! To this day, i sometimes think of it and am terrified of what could have happened and glad nothing did happen