Yup. But I don't think that's really a problem for DW since you can just cast decoy beforehand and then auto attack cancel with rampage and...
You can do a 1st short combo which end with magic impact, continue to 2nd combo of storm reaper and then meteor. For example 1st combo: reflex >...
Try to find the escape icon and go through it. And then re-enter the boss again while choosing difficulty.
I was also struggling back then as a 1h shield dps when all I have is only tempest at lvl 120-ish, so I choose to hit all normal mob with tempest...