The grout line disappear's and does not extend all the way to his left leg, which would be the case if he was not holding anything in his left hand which, if he was, would visibly cover the grout line. The horizontal grout line mysteriously dissappear's because the rifle that he is holding has been Photoshopped out of the picture and the person who did it forgot to extend the missing grout line all the way to the perp's left leg.
They may have done this to intentionally withhold evidence from the public, or to protect evidence by keeping the make and model of the rifle secret. Whatever the motive it appears the rifle he is carrying in his left hand has been digitally erased.
Carefully look at his LEFT HAND. It clearly appears that he is holding something...
Something is going on there in this shot, too. The dark area between his shirt and arm is not that black molding on the wall. It goes up too far. Looks as if he is holding something.