>. I understand having power in both hands but to get hurt
>like that from a jab(that wasn't even on the chin?).



People keep calling it a jab, but I think that's misleading for two reasons. 1, the way he turned the shot over was more like a short hook in the vein of the way Floyd would throw left hooks (see the Gatti or Hatton fights), 2, it was throw from a southpaw stance with his power hand, so it was a powerful shot. Not only that, but as Brook said in the post-fight interview, he didn't see the shot coming, and those are the shots that really hurt you. An unseen shot from your opponent's power hand would rock anybody.