Quote Originally Posted by Chrono_Rising View Post
Actually I would believe it is only a gain under party buffs and a loss otherwise since bloodspiller is not 1 dark arts above our combo potency. The exception is when buffed with dps utilities.
Uptime is a factor as well.
The idea behind TBN being a loss is that BS will cause you to delay your GCD combos (missing on MP and blood) but if a combo gets interrupted because of a mechanics/boss jump, you lose that benefit.