User blog comment:Master Sima Yi/Assassinews 28-02-'13 — Assassin's Creed IV: Black Flag revealed/@comment-4829046-20130303022626/@comment-257535-20130303091801

So...

Stab a guy and run away, in the wake of potential screams, drawing the attention of everyone on the streets.

Or...

Stab a guy and walk away with the girl he was with, ensuring via threat alone there are no screams to draw anyone's attention.