I have experienced something similar to this in Blitz Arathi Basin.
An Alliance Druid went stealth to me at stables. Out came a giant humanoid owl and shot me with 3 palm bazookas and killed me. I only got his health down to 3/4. It’s fast and furious attacks were like godlike.
I rezzes and came back to claim stables.
That Druid broke stealth and instantly shot me a few times with its Buddha palms and I died trying to fight it again. But what amazes me is that it didn’t heal itself. So now it’s half health because I took another 1/4 of it off.
I rezzed again and de ja vu happened again.
This time its health is now at 1/4.
Rinse and repeat I killed it because it didn’t heal itself.
I just thought it was messing with me as it’s a godly player, but I also think it may be an intelligent bot, only if it healed itself.
However I was in last seasons PvP gear. Was just starting to upgrade to this season 3.