Then why did it used to give us Damage Flyovers when it hit shields? At some point they changed it to a single tick shield drain. I believe it occured when the new skill tree went live. I honestly believe it was a mistake, one of many in the sci skill tree, and we all know how much cryptic loves admitting mistakes... "working as intended"
As far as I can remember cpb never showed up as damage via floats, and its always been a "as soon as it hits it hurts" power.