Sounds like he is deranged or impaired in some way. Those guys are a lot like dogs, if you make eye contact or engage them in any way you can have an issue. I would simply walk away (preferably before he sees you) and keep an eye on him from a distance. If he does see you make up a story where the park is if you don't really know. I would also get a hold of someone to come check him out so he doesn't become a danger to himself or anyone else.
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