Here is his burst with fully stacked Steady Blade and shooting 3x Shuriken:
http://imgur.com/a/tDFN2
I know this is rather unrealistic, but it is good to know your maximum potential. Mind you, you also have additional two charges on Shuriken after jumping with completed quest to finish the job (
If you can live that long). However if you have someone to stun them and you save your cooldowns, you know you can burst it down.
Been checking Steady Blade, fully stacked it does 754 damage at level 20. Baseline damage of Swift Strike is 471, the math is correct. No?