I have been seeing a lot of issues with mobs resetting when they are still well within their boundaries. From what I can tell it is pretty random. Generally only seems to occur when pulling the mob even a slight distance from it's position (say 5-10 steps). This makes it impossible to pull them out of help/link range for the entire fight.

The reset doesn't occur until the mob reaches 1/4 health and then suddenly it runs back. I have only been noticing this on aggressive mobs.

I think it's great to have links/help but give us a way to strategically defeat it please. You can use the mites near Nophica Wells as an example. Try and drag one just the distance of "Throw" and 50% chance it will run back at the 25% HP mark.