Just tried that, it appears to have absolutely no effect on the scene.
Maybe it's the bsp itself? Valve maps don't have any problems.. I wonder if it's the fog settings on stoneyridge or something that's doing it. Or maybe it's because that particular compile didn't have HDR lighting run.
Guess I'll have to experiment some more.
I am having the same issue with Hella and that doesn't have HDR either yet. I bet that is it then.
It's seriously the most brilliant* SFM video I've seen. I've watched it four times by now, and giggled out loud every time.
It's not nearly as advanced as some other SFM videos out there, and the part right at the beginning felt pretty pointless, but the it's an amazing example of the principle 'less is more'. Keep that in mind, guys. If you don't have the time and patience to make an epic sketch with Valve-quality body animations and a continuously clever plot, you can just make a video of silent, subtle face posing and it may end up being just as entertaining.
If you feel like doing something like that, try throwing in some grunts, sighs and/or laughs as well. I think those kinds of noises could improve it even more, and there are certainly a lot of great ones to pick from among the classes' voice responses.