Chance to Intimidate on hit mechanic

I am wondering how the chance to Intimidate on hit for 4sec mod (from lethal pride) works exactly. Is the 4sec period refreshed every time it s triggered (10% chance)? Or it has to finish the 4sec period to be triggered again.

The question I am trying to solve is wether you are better off with the mastery ruthless hits intimidate enemies (every 3 hits guaranteed) versus the lethal pride above (5 hit avg to trigger). If it can be refreshed/reset to 4sec every trigger, it s worth it at very high attack speed. Otherwise the ruthless one is superior.