Did another video of running a charmed mob back and forth across the pad in the basement a couple dozen times, then running the same mob back and forth after I broke charm:
https://youtu.be/w_j_Tru0w2Q
There was one time when he was UNcharmed that it looked like he stuttered as he crossed the pad, but if he teleported anywhere he was instantly back down on my z-level and chasing me.
It seems that, now, in HS, charmed pets and aggrod NPCs do not activate the teleporter pads at all (or very rarely). However, fleeing NPCs not only activate every time (that I've seen ... several times) they touch a pad, but they also definitely beeline towards a pad if they are remotely near one. I've never seen a mob that was close to a pad flee away from it, but they always flee towards it. Whoever programmed that isn't helping my argument with mick that HS isn't the hardest dungeon in the game!