Who were they shooting at in the back of the house on the FLIR tapes? I know a concussion device was used on the top of the storage room.
No one. That is government disinformation designed to discredit it's critics and make everyone think the BDs were still alive at the time of the fire. The autopsies show everyone was already dead. Some for a long time.
In the second Waco film, Waco: A New Revelation, is footage of the back wall of the concrete panty. It is clearly seen that there are no pockmarks or craters which are left when a bullet strikes masonry. For mor details, see: Waco: A New Revelation