How does the new whirlwind work?

[cliff_arnesen2008]

• Fortifying Whirlwind: Now grants 3…6.6…10% damage and damage absorption for 2s. (Max 5 stacks) (PTR)
  IN GAME: Whirlwind hits grant fortify on self, increase damage absorption by 10% and slashing damage by 10%

The way in which the tooltip is worded indicates you get 10% dmg absorption per tick + 10 % slash dmg reduction

[Phylla]

I’ve just been testing this perk on a dummy and the alleged extra damage isn’t working. Only the fortify works (and the buff doesn’t really say much other than fortify). The only damage buff I get is from Mauler’s Fury.

EDIT: nevermind. I tested properly without light attack buff or mauler’s fury and it does indeed give extra damage, but those 2 seconds feel so short. You have to spam maelstrom as soon as whirlwind finishes in order for both attacks to be buffed. It’s a very tight window, but it does work. My bad.