There are two paths you can take from that trigger point... one of which seems to have a fairly immediate payoff and is a cool puzzle in and of itself, the other is much more abstract and requires that you see patterns that are very difficult to see... it's almost as if you have to trust your intuition. Think of things that you would follow if you are seeking truth or answers and follow those things and when things that present danger or hazard present themselves stop going that way.
The way the designers did this is sublime in the truest sense that whether or not you know you are seeing the signs, your mind is holding onto them. It is very subliminal. Trust your instinct, not your logic.