Now Tom,We all know this was an unethical shot.

A compound bow ain't as powerful as a centerfire rifle.He should have waited for the better shot.

A 30-06 or maybe a 7 should have been min. for a texas heart shot..........LOL
But seriously the guy who did the shooting is probaly in for a world of grief.Criminal charges and more likely than not a civil suit by the perpetrator.Any dummy should know you don't chase someone down and shoot them in the back especially if it is not your property.even if it is ,if their back is turned to you the law does not see them as a threat any longer.But like you said it would be a heck of a memory.