Shelbys thoughts are concerned with what could get him caught, and he's out there to make sure he doesn't by collecting whatever evidence he's left behind by being a private eye. At least that's how I see it. It's Lauren that gets things confused by being there to actually solve a murder. So when looking at the scene, you the player are actually thinking this pair is on the site to collect clues to solve a murder.
The part with Shelby kills the clock guy... I was thrown too. But wasn't there a close up of Lauren for like a solid minute (exaggeration) when the clocks were going off? Our eyes weren't on Shelby right then. Coulda been then.
And about the Origami in Ethans hands. The black outs were touched on by his psychiatrist, in that people that experience extremely traumatic events suffer some way. Of course, he explained it as a possibility for multiple personalities or schizophrenia. As for the Origami itself? Just a red herring. Not meant to be explained so much as to throw the player off of the case by drawing to much focus on it.
