Emilie nodded and pulled an arrow immediately into the knock. She'd stay quiet now. They all needed to. Any screaming and all the infected in the area would hear. She lifted a hand to the door and pushed it open, slowly. Nothing straight away. She pushed the door open fully and stepped inside, bow fully extended and ready. Nothing. Not yet. She waited to one side and looked back at the others. They'd be able to get where they needed to, she'd wait for Annie before continuing. Runners were often too fast to react. 

Across the street, Andrew thought the same thing. 
"Well clear rooms together, it'll be easier that way." He added, reading his pistol and his knife. Mary stood behind him, nervous and obviously terrified. These runs and raids scared her more than the infected herself. Someone was always left behind. Everytime. It was beginning to break her. Andrew eased the door open, within half an inch, he spotted an infected. The thing was hunched over in the living room. He lifted a finger to his friends and eased the door open more, waiting and testing the thing inside.