Episode 16 of Watson Season 2 straight up answers what we were low-key left wondering last time: How and why exactly is Watson hallucinating Sherlock?In this episode, Watson finally understands why Sherlock keeps showing up in his head. The reason for this being: The fall from the waterfall left him with a brain injury, and cutting down his meds made it a lot worse.At the same time, a case involving a mother and her sick child starts mirroring Watson’s own mental state and whatever he seems to be going through right now.Spoiler Alert for Episode 16 of Watson Season 2. Watson Season 2 Episode 16 recap: Watson realizes his mind has been failing him all alongWatson finally understands why Holmes keeps showing upEpisode 16 of Watson Season 2 lays everything out in the open. For weeks now, it has felt like Holmes was present there all along. Now it turns out that the voice was coming from inside of Watson this whole time. View this post on Instagram Instagram PostOnce Watson pieces it together, he realizes that the injury from the fall messed with his brain. On top of that, he had also been skipping out on his medication, and this combination led to the hallucinations being created.Now, Watson already knew, deep down, he did know. Holmes always showed up whenever Watson was about to cross a line or make a bad decision, and it was like his brain built up a version of Holmes to keep him in check all the time.Once he realizes this in Episode 16 of Watson Season 2, there’s no denial phase anymore, and he comes to terms with it pretty fast. He knows he needs to go back to taking his meds.But the timing is just terrible. Just as he’s about to fix things, Laila calls him in for a case. So instead of sitting with this realization, he has to go straight into work while he's still dealing with the fact that his mind has been lying to him.A sick child, a lying mother, and something that clearly does not add upThe case in Episode 16 of Watson Season 2 starts as a simple one. A woman named Shelly brings in her daughter Cora, claiming she has cancer. Within minutes, that story falls apart. There’s no medical history, no treatment records, nothing.Now, what Cora has is a fever. She’s in pain, and Watson confirms it himself. So something is wrong, just not what the mother is saying.Then, Shelly keeps interrupting, answering questions that are being asked to Cora, and trying to control every nook of the conversation. But, the minute the doctors push back? She leaves. Not just steps out of the doctor's room, but the woman straight up disappears and abandons her daughter in the hospital.Cora starts talking more once her mother is gone, and she mentions a sister, Abby. She says they don’t go outside, they’re homeschooled, and basically hidden from the world. To make things a bit more eerie, even basic requirements like sunlight seem unfamiliar to her.The truth about the house and what the girls have lived throughWhen the team tracks down Shelly’s real address in Episode 16 of Watson Season 2, they see that the house has no electricity, and neither does it have any running water. It is also understood that Shelly grew food herself and was cut off from the outside world completely.Cora also doesn’t think her life was bad because she actually believes that her mother was only trying to protect her. And when she gets exposed to a little bit of sunlight, her skin reacts badly to the rays, which only reinforces the idea of what she was being told all this time.This is where, in Episode 16 of Watson Season 2, Watson starts thinking differently. Instead of chasing an obvious answer, he leans into his instinct. Not the hallucinated Holmes, but his own version of that thinking.Before they can fully understand what is happening, Shelly comes back when she sneaks her way into the hospital dressed as a nurse. She tries to take back Cora, but in no time, it turns into a confrontation, and she even pulls a scalpel.Watson doesn’t fight her physically, though. He talks to her, calms her down, and gets her to slowly open up. That’s when everyone realizes that she’s mentally ill, and that Shelly genuinely in her heart believes that the world is dangerous and that voices in her head have been guiding her to make the right decisions.The diagnosis, the cause, and the final crashAfter everything settles, the situation in Episode 16 of Watson Season 2 starts to make sense piece by piece. Shelly is diagnosed with paranoid schizophrenia, and her actions come from a place of genuine fear, not with an intent to harm, and she thought she was genuinely protecting her kids from the outside world. View this post on Instagram Instagram PostShe also admits how Abby is hidden back at the house in a secret space, and the police didn’t even know to look there during a previous search of the house. However, when they do find her, Abby also has the very same extreme sensitivity to sunlight, just like Cora.Watson also realizes that the problem isn’t just the isolation, but also what they were eating. Their diet, which was heavily based on celery, caused a reaction that made sunlight dangerous for them. Once that stops, their bodies can, in fact, recover.A temporary solution is decided on, i.e., the girls go to stay with a relative while Shelly gets the treatment she needs.Then, when Watson and Laila head back to the house to grab the girls’ belongings. On the drive back, Watson hears Holmes again, and it distracts him. He misses a deer on the road, and the car flips and crashes into a ravine.In Episode 16 of Watson Season 2, the real truth about Holmes and his "presence" in Watson's life changes how you see every past episode and every interaction between the two men.We now know that Watson was fighting his own mind (without even realizing it), but now, the realization has set in.However, just when Watson starts to regain control, the episode ends with another crash, literally, and it sets up the next episode.Stay tuned to SoapCentral for more updates on Watson Season 2 and more.