Since breaking eye contact stopped him from approaching you, he’s probably harmless. If he didn’t back off, I’d think he was problem.
Your thinking that he’s gathering intel is just the illness. I think you know and have insight on that because you put this under the Dx’d Sz/SzA category.
@HollyHobbie , I’m aware most people would say it’s just paranoia, but I’m not sure really if that’s what it is or not. I’m trying to use skills to remain calm and think as clearly as I can.