I would imagine this works for any level range of the game - assuming you have the skills.
1)Shield Lob - run to boss
2)Circle of Scorn once in range
3)Flash as your running through the mob
4)Start your combo
Dps can more or less start as soon as you jump in the air for your Circle of Scorn.
This is my opener - no one pulls off me.
This is my FC mates opener who I do not pull off of him with an I89 Monk.
Nothing special.
