Cuts both ways; the people involved are, for the most part, harder to make disappear as long as they're making themselves loud and visible. That crowd out there around the bonfire? As long as they stick together, they're not targets. The noise makes it harder for someone in the hallways to hear anything, depending on how much noise the murderer makes to begin with.

You'll have to forgive us for not publicizing our work; in my past experience, the more information about progress is made public on a serial killer investigation, the more information is given to the killer to avoid being caught and keep killing people, and the more dead bodies you end up with, assuming you ever catch the killer at all. I'm surprised you wouldn't know already what happens when you disclose too much information on a case like this, after associating with the police so closely, and if you're aware of everything the people involved have been doing, then I applaud your newfound psychic powers.