TADS 3--Wandering Actors

So in my current WIP (a Spider-and-Web-esque thriller, BTW) I need actors that will wander around and keep an eye on the player. I could use GuidedTourState, but that class is designed, obviously, for a guided tour.
I looked at the TADS 2 manual and considered adapting the solution in chapter 10, however I think there’s a much better (and easier) way to do this in T3; I just can’t figure out what that is.

Have you tried AccompanyingState? The Tour Guide has a discussion of it.