Well, I can say I've seen groups of THMs since beta just sitting out in places like the Black Shroud spamming Blizzard 2 for literal days (I also see WHMs spamming Holy), and I have seen more than a few botting THMs in Guildhests (teleports underground to the boss/target, etc), so, you may not be too far off. Unfortunately there is always that chance that yes, they're, as you put it, "noob friends," it's just unlikely.

You could report them and you don't have to worry about repercussions since that's the GMs' job to investigate, but don't expect anything to come of it.