Apparently Shadows told Zepher about it on Day 3 (or was it 2...?) during his roleclaim. Zepher believed it immediately, but I was a bit more skeptical. I generally take every claim Shadows makes with a grain of salt, and frankly, I wasn't about to believe something as far fetched as a cult (although not nearly as far fetched as I thought...) from anyone, nevermind Shadows.
One thing I notice is that both Shadows and Hinck had vests. I'm guessing that wasn't a coincidence?