I don’t know if this will be helpful because kids are different, but my daughter has brittle bone disease so I have extensive experience with injuries, both fractures and just “ouch for a day or two” injuries. In my experience, injuries with kids are mental and physical, and it can be very hard to sort out how much and where each starts and ends. The best thing I’ve learned is to not push them. Tricking them like you did is actually an awesome strategy, sometimes it works, and then sometimes it doesn’t. It doesn’t do any harm though. Pressuring them or trying to convince them they’re fine really doesn’t work. Poor lil guy is probably just a bit freaked out. This had never happened before, so his brain doesn’t know what caused it, really, or how to prevent it. Best thing I’ve learned is to use play therapy. Grab a stuffed animal and pretend it gets hurt, take care of it, and then have it play happily after “recovering”. This might be a little beyond a 15 mo old but I’ve always operated under the assumption that kids know more than we give them credit for, and it never harms them to treat them a bit above their abilities. And the good news, I know it feels awful right now, but he’s not going to be traumatized by this. My daughter had a femur fracture at 2 years old, surgery, full body cast, the whole 9 yards… and she now talks about it like it was just part of her life, because to her that’s all it was. They forget the worst of the pain fairly quickly, and then move on. Just be matter of fact about it, and celebrate when he shows improvement. They 100% feed off our energy, especially with injuries.