All mechanics were followed to the letter. DPS was fine, healing was fine, tanking was fine. As we got to the last phase (tantrum phase) of the TFB his health jumped to 32% and almost instantly right after that hit his enrage. A group in my guild did the TFB 11 June 2013 with no issues.
I have come to the hypothesis that 2.2 has bugged this encounter. I beg the dev team to pay immediate attention to this. Thank you.
Can confirm that his health was at 30%ish after the last set of tentacles die and he goes into whackamole mode. My guild still killed him in story mode but it was a long last phase for sure.