@Justrelax
In 40 degree heat, with no phone? I don't think this is normal
Something went wrong. Something isn't normal. But going off alone and exploring populated areas, or stepping off the path for some reason aren't necessarily the decisions of an ill or upset person.
We don't know where he is. We don't know what happened before. We don't know what he was planning. We can't surmise anything about his mindset. All we know is that he left the group, on foot, with their knowledge, and that he walked past some CCTV cameras. There's no abnormal mindset there. Many of us might do the same, even if you think it's not 'normal'.