Are you referring to the same Mike Powers who says that there was no broken window in the front of the school???
The police broke numerous windows and doors for entry points...Looking at the hole in the front door, it would be inconceivable that someone loaded down with ammo and carrying a rifle would want to bend over and step up and thru that hole in the glass panel...Perhaps he could have reached around thru the glass and opened the door...Not enough info there...