What Strikes me is that the officers in the hall didn’t seem too concerned that someone just shot through the door and killed a woman- one fella raised his gun briefly towards the area where the shot came from, then lowers it, and goes on to ignore the area where it came from
Since it is now clear that the Capitol cops were assisting in the “siege”, that is not surprising.
Appears to me that they were expecting almost exactly what and where it happened.
And don’t forget to mention the thumbs up he gave to the shooters direction after lowering his rifle.