What makes me skeptical about the mushrooms is that he peaked very suddenly at hour 5-6, and I’ve never heard of someone doing that. It’s also weird that he didn’t perceive himself to be getting higher prior to that but felt like he was getting more sober. If he’s completely off on his time frame, or isn’t as experienced as he’s saying, that would make sense, but assuming he’s correct, I don’t think it’s out of the question that he ingested a different species of mushroom than he was expecting (like an amanita for example).