d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Fleet Fighter [USEFULNESS] A bonus offered by this charm is especially handy if you fight often but, even if you avoid open conflicts, it is a good idea to have both weapons drawn, just in case. [BONE CHARM PROPERTY] 
Holding your weapons in your hands doesn't slow you down.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY