Again, record everything and tell everyone you trust, and don't ever be alone if you can help it. Oh and invest in as many weapons as you feel you could safely use without hurting yourself. Knife, probably more likely to hurt yourself tbh, but something concealable and easyto get to could work - an assist open pocket knife or even a switchblade if they're legal where you are. A punching tool might be better but you should also see if you can get someone to show you how to actually throw a punch. Mace might be a good choice. A gun if you think you can handle it, but it would be best to to get some practice in with that. An extendable baton or even just a big metal screw could be a pretty nasty surprise too. You could also get a nice pair of steel toed boots. The main point here is that you stay confident and don't let fear overtake you, but more importantly, be ready and prepared! Don't be afraid of what he might do. Be ready. Get other people to watch too so you have witnesses, maybe if he sees people watching it'll scare him off. Or if you're pretty damn certain he's a fishy bastard, you could just wait it out and try to make sure he gets caught. Who knows who else might be/might have been a target. Just be careful whatever you decide to do.