But he didn't rush in the room. He was walking from the room next door at a slow, deliberate pace, he slowly walked into the bedroom. There was no rush by him to get in there and interfere. She knew he was listening too because she tried to say it to the guy in such a hushed tone to not be heard. In the end Philip acted shocked that he had killed her but really she was insignificant collateral damage to his real goal with that guy.