Your Eviscerate and Envenom abilities have a 20/40/60/80/100% chance to refresh your Slice and Dice duration to its 5 combo point maximum.
Cut to the Chase is a talent in the Assassination tree, you will need to spend 50 points in Assassination to max it. This talents gives Eviscerate and Envenom a chance to refresh the 5th combo point duration of Slice and Dice.