Just wondering if you would get a 6% chance to doublestrike if you had both.
Also, would it stack with the 5% from Tempest 3?
In general does Doublestrike stack? For example, would a rogue with an epic smallblade (3%), the opportunist feat (3%) and Hail of blows (3%) get a 9% chance to doublestrike?
What if he had 2 epic smallblades- would he get 12%?