very good video, wildes are tough customers and while you said the shot was a little low most people hit too high and go over the lungs or hit the spine, not a slam dunk either, they are tough fellas. Penetration is a frequent problem with wildes did you see how much the arrow swung about on the hit? There is the answer to the penetration the glancing bone hit threw all the other factors out of the window. No matter the head, shaft, bow weight etc. That leg bone is hard. He was a fighter for sure, you are lucky that he held up a little and the follow up shot was good, the right kind of hunt, fought through to the end!
chrisg