I reviewed the you tube video again. In some scenes Mr. Thomas appears to be behind a large counter. But in the scenes of police taking evidence after shooting there are a lot of standard glass display cases, not suitable for placing armor.
I also wonder if he was behind some kind of cover when making the 911 call, while a gunfight was in progress.
Also interesting scene at end of video, where Mr. Thomas interviewed after leaving LA. Briefly shown is rack with shotgun and AK. Interesting video and interesting person.