It's hard to imagine how an accurate head count could've been done in such a short space of time, reported to the police, background checks confirmed, and it out on their radios treating LHO as the main suspect -that level of genuine professionalism seems well out of charachter for the Dallas pd at the time, considering all the other major fuck ups they made. With bullets flying around the plaza, the extreme panic, confusion etc, most employees would no doubt run away from the area/line of fire down another street? Certainly not immediately back into the tsbd where word must have been getting out that shots were fired from?