I'm not so sure it was too low, I think it was to far back. Notice the wound is almost perfectly vertical. If if were 1/2 inch behind the heart it would have missed it.
If the broadhead had hit so that it opened horizontally, might have had a different outcome.
Luck of the draw. In this case, bad luck.
JMO
Last edited by 99guy; 12/18/14. Reason: said vertical when I meant horizontal and vise versa