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Deadly Calm has a lot more potential than people are giving it credit for. You can fit all 3 free HS into a CS, but the main strength I see is allowing for a lot of enrage uptime. Because Enrage lasts 6 secs and the Deadly Calm buff lasts 15 sec, you could potentially hold each free HS to maximize your uptime, since Enrage is activated by yellow crits only (don't forget Incite).