I don't know what kind of angle you had for the shot,but I don't think you clipped his spine and the only place I can think of where you would hit enough hard bone to bend and chip blades is and only get meat and fat is the breast plate and shoulder area.Both of these areas especially around the chest plate have a lot of fat.Just my 2 cents.Hope you find him one way or the other,or better yet maybe you will see him again.