Their opener subterfuge+stuns usually take me to around 30% hp, I'm stunned all this time.
If I trinket it they just vanish and repeat. If I bubble it they just vanish and repeat. Constantly slowed or stunned and they basically just dodge/CoS every single of my abilities.
This is so frustrating, the only thing I can do is stun them and bubblerun myself out of combat. Which rarely works either.