Windfury Attack

[dardennf]

Hi, I want to know something about the proc of Windfury Weapon.

I was looking in the combat log and I realized that sometimes there was this attack Windfury attack and sometimes this one http://www.wowhead.com/?spell=25504.

With 2 One-Handed Axes equipped.

It might be the Main hand and the Off-hand proc, but it causes a problem, there is no 3 seconds of ICD between these 2 differents spells.

What do you think about that ?

Sorry for my english.