How to Clear a Building

Sol, I need you to find something to lock or barricade the main entrance door. Until we've cleared this entire building, no one has to be alone. Ever. Angel, I'll cover the front. Check the elevators. Pegs, Riley, come over here by me. What is he doing? Well, unless we have to, we don't want to shoot anything down here. The sound could echo out of the building and bring more of them here. We don't know exactly how it spreads. Let's head up towards the lobby. It was already half-waking before I even started on this neck. Hey, make sure you don't get any blood on