User blog comment:Master Sima Yi/Assassinews 28-02-'13 — Assassin's Creed IV: Black Flag revealed/@comment-6821378-20130304085456/@comment-4829046-20130305032902

I never figured out how to do that in regular Combat. So far the only times you MUST do is in the bar fight, against some of the Boston Brawlers and in Connor Vs. Haytham.