This is a bug that’s already been reported. Don’t know if they are aware of it, though…
So, yeah - sucks hard. If you’re running LoD Hydra with a channeling skill, you can at least do something about those mobs yourself… the TV set on the other hand is pretty much helpless, since other skills won’t be buffed by it and deal so puny damage that it takes an age to kill them. This definitly needs to be addressed.