So, browsing through these forums I've found a lot of posts regarding Combat's Blade Flurry and how awesome it is during the Wind Lord and Amber-Shaper encounters in Heart of Fear. Well, yes, Blade Flurry is very awesome but it is currently overestimated by the majority of rogues as soon as there are damage amplifiers involved.
Blade Flurry currently works like this:
If there is a damage taken debuff on the primary target, your damage on the secondary target will not benefit from this debuff at all. You will not deal 600% additional damage on the adds during the Wind Lord encounter on heroic mode. Neither will you deal XXX% more damage during the Amber-Shaper encounter onto secondary targets if you handled the Abomination debuff well. Elegon is no exception here. If he has more stacks in Phase 2 and Phase 3, you will not deal more damage with Blade Flurry onto any kind of adds.
If there is a damage done buff to your primary target, your damage on the secondary target will fully benefit from this buff. You will deal 100% increased damage to Garalon if you cleave off of his legs. Very awesome.
Anyways, I've seen a lof of these posts on this forum and others and thought some people would like this knowledge.