If it breaks(clean) in two, one piece is in your hand(if you're holding it) the other(the tip) gets pulled by the string over your shoulder. If it breaks(clean) into three pieces, the additional piece is a shard that is propelled forward and is usually smaller than the other two. The third piece will be bow back on one side and the fragmented bow center on the other. If you refit the handle and tip section, the third piece would fit roughly centered over that break. I've only had this happen a couple times, usually with really unfit stave like dry rotted for example. I was really good at collecting bad staves and breaking them when I first started.