She came up the stairs with the guy in the grey kettle, who after the shot had his hands up. He spoke to the guy in the suit and then crossed over the body, ducking down and disappeared, it down the stairs, down the hallway, he was dressed as Antifa.
Also when the two came up the stairs, the guy at the top of the stairs, waves them up, then they push through the crowd together, towards the window. No hesitation straight up into window frame.
Mere second from top of stairs to shot.