Reckoning

From WoW: IncGamers World of Warcraft Wiki

Talent: Reckoning
Effect: Gives you a chance after being hit by any damaging attack that the next 4 weapon swings within 8 sec will generate an additional attack.
Statistics: Rank 1 = +2%, Rank 2 = +4%, Rank 3 = +6%, Rank 4 = +8%, Rank 5 = +10%.