Okay, okay, so you all know walking makes less noise than running in the game; 
however, sometimes you just need that extra speed running to get up close to 
enemies. 

Rolling makes your character move at the same speed as running, but at a greatly 
reduced noise (compared to running). It's not completely quiet as crab walking, 
but it is not as loud as running across crickety floorboards. The best part: 
your assassin can change directions while rolling, so roll like Link if you need 
speed and stealth.