I like the pairs idea. If possible, call/text the on-duty watch person your situation (can be done while on the phone with a dispatcher). Put the dispatcher on speaker. Stay on the phone with the dispatcher until a LEO shows up. Let the person you're following know you're on the phone with the police. I have a tactical wak or an 18" Teflon rod I can carry (both in my car). Either would be useful as a deterrent to physical escalation. Use a flashlight.