It's a subject with mystery in it. Conventional methods to come to a conclusion aren't really working so we're just trying to think outside the box, because that's maybe what's it's actually about.
I have developed the ability to pick up subtle cues in conversation and pay attention to details. While I am talking to someone I constantly keep track of their body language as well as mine including the conversation. Multi-threading FTW. That's why I was able to pull out these small things on which I base my conclusion. Over-thinking would be if I continued there without wild ideas.