Lesson learned. This time I did have a camera. If your not too sure what your looking at, one arrow has gone through the end of another arrow. The reason why the arrow that has been struck has not split open like a peeled banana is that there is a very fine plastic wrap on the end of the arrows holding it all together.
Last time I did this a few weeks ago, I didn't have my camera & one of the other archers there photographed it with a camera phone. Both arrows were shot from a distance of 20 yards.