Greetings Shaffer,
I see that, as always, Hip pretty much has you covered, but I'd also like to toss in a few questions and comments of my own.
This, honestly, concerns me a bit. You say in your intro that you thoroughly research fights ahead of time, but here it kind of seems like you didn't. Between normal and heroic, there aren't many major changes for tanks, especially in regards to Talon Rakes. I know the timing can be a bit hairy, but when you're on the boss it is basically the same fight as normal, it just hits harder. I feel that it should have been apparent to you that the timing of the major-damage abilities are essentially the same and the dungeon journal should have been able to give you an idea of how to rotate your CDs. You would have had a special advantage in timing your CDs by asking your tanking buddy ahead of time how many Rakes you'll take and if 3min CDs will have time to come back up.
I did exclusive 10m tanking until this current tier and one of the largest challenges I faced was learning to not only rotate my own CDs well, but to also be able to be comfortable calling for external CDs. How well-equipped are you to thoughtfully call for external CDs? How does the other tank's survivability factor in?
Alright, so there's been a bunch of talk about survivability through CDs and active mitigation, but you also have a wealth of unique utility available to you. How have you utilized your toolkit to aid your raid? When researching fights, how do you try to determine what talents and glyphs would be best? How do you plan the use of your toolkit prior to trying out a new fight?
Lastly, a strong connection to my tanking buddy is of the utmost importance to me. How comfortable would you be talking over fights between attempts and before raids with me? Are you familiar with warriors and do you feel you could adapt your playstyle to make optimal use of us both?