Yeah, I've noticed this as well. Not sure what exactly causes it either; just started looking out for it. I will say I had noticed that it had reset in a match after I re-spawned. Problem is you might not just get a buff; you could also get AD and experience. It currently has the potential for exploit (join pvp, get it to…
This happened to me as well when fighting the end boss dragon in the lair of the mad dragon dungeon delve. Every time I would use deft strike against the dragon I would wind up in front of it. So I think this is a glitch with all dragons.