A 77-minute video recording captured from this vantage point, along with body camera footage from one of the responding officers, obtained by the American-Statesman and KVUE, shows in excruciating detail dozens of sworn officers, local, state and federal — heavily armed, clad in body armor, with helmets, some with protective shields — walking back and forth in the hallway, some leaving the camera frame and then reappearing, others training their weapons toward the classroom, talking, making cellphone calls, sending texts and looking at floor plans, but not entering or attempting to enter the classrooms.