Interesting thread. So if it was a recurve, long or compound bow, he was at full draw. Either because he thought there was game he was preparing to shoot at, or because it had a draw lock as Ron 1 said. Or, possibly he was hunting with an X-bow and had the safety off and finger on the trigger. Indexing the finger is not something most folks understand, but it does help avoid shooting things and people you do not intend to shoot. Then again as GB and hunt-m-up posted, it very well may have been intentional.