Sometimes people will be shooting with say kids and they grab a arrow and draw back. The arrow is to short and pops out of the rest and off the shelf. Then they go to let down and the arrow kicks over on the let down and drives threw some meat

The other one is that someone trys to shoot a arrow that is cracked or a way under spined arrow and it snaps on the shot. That picture looks really clean and makes me think the arrow was whole and had a field tip on it to go threw so strait.