I was aggroed while solo by an Orc in La'Theine Plateau while resting and engaged. I checked it right away and found it was Tough and was too low in HP to take it. It was at 95% HP when I started heading towards the zone. I called for help right away, it was at 95% HP. No more than 5 seconds later, it's name went from orange to yellow unclaimed while still at 95% HP (it had no DoTs on it, it's HP didn't move at all). Then 2 seconds later, someone ran up to it and claimed it, it's name went purple.
I've never heard of a CFH'd mob going from orange to unclaimed yellow before both losing aggro to the person who CFH'd on it and reaching 100% HP first. Can anyone explain this to me?