Glass half full gives you +1 damage per shot on the grasp you would need a very big mag in order to get an extra kill. With secret round you get an extra shot if a round is missed. None of these adds up to an extra kill, your triple down must have been low health to start with. Not only does it not add upto an extra kill using maths, I have a grasp with glass half full and used it. It a useless perk on a pulse with a mag like the grasp. Put it on an auto with a mag of about 50 and its fantastic. With reload perks you can do far more DPS in 60s than a slower reload and +1 damage.