You don't, but I and others see something there, which makes the Grassy Knoll fatal hit impossible to discount as you apparently want to do.
Where's your bullet?
I don't know, maybe exploding bullets were used. It does appear to have been a professional hit, and in any Google search you will find plenty of those with facts who have studied the assassination endlessly backing up their claims.
You see a sniper in that enlarged photo? I'm sorry, I just don't.