OK, I guess that makes more sense. It's best used where there are multiple targets if your goal is DPS. I think a damage per tick or a damage for x ticks would be a better way to present the numbers.
i'm not sure that makes sense based on the current description. one hit of each at-will should do what the description states. It happens for other abilities, just not this one. Why put 4K if it's based on time but not put a point of reference to that time?