User blog comment:Xilinoc/Ch. 549 - The Stormbringer/@comment-6916556-20130919215544/@comment-11051098-20130920134028

I too think it refers to Sui-Fêng - given her wind-type Shunkô, she's more likely to be The Stormbringer.

Whatever BG9 might actually mean, it's definitely sure that he/it is cold-hearted and emotionless. It shows no remorse and doesn't stand back from using the lives of friends/relatives as a bargain to get answers from its opponent.

It took a seemingly full blow from Sui-Fêng's Shunkô and were blown away, but remained standing in the center of the destruction with no visible injuries, although we could only see a part of its mask with a glowing eye.