Based on what you describe, one would have to wonder about a psychotic episode. Especially in light of his age, personality type and sudden change in behaviour. Unfortunately, I see this quite frequently in my line of work. I think it would be reasonable to try to locate him and see if you can provide any help as it sounds like he may benefit from a medical assessment. However, I would also be very careful in how you do this and make sure to look out for your personal safety. That being said, this may be something completely benign but there are definitely some worrisome signs.
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