during any of this? as a matter of fact, that day there was reports of shots fired through the house main door on to the floor of the chamber. reporter: later those reports would move to be false. this video captured byrd instructing members of congress to don gas masks. he says officers barricaded the door, what he considered the last line of defense. i had been yelling and screaming as loud as i was, please, stop, get back, get back, stop. we had our weapons drawn. there is a gun! reporter: byrd, only his hand and gun visible, targeted a figure trying to climb through a window. he fired a single fatal shot, hitting ashli babbitt. she was 35 years old, an air force veteran, trump supporter, and qanon follower. we see your arm out there for a considerable amount of time. bru wavering?