So I flew into Gadgetzan on my lil' warlock and noticed that there was fire EVERYWHERE. Yep, I just missed Deathwing. As I gawked at the massive flames and my good fortune, I neglected to notice that "fire EVERYWHERE" included very very close to the flight master.
Oops.
I actually got the achievement a little bit before I died. My guess is that it's either possible to succeed without dying or I was lagging somehow. It was pretty awesome, regardless.
This screenshot is from after I resed in a safe spot.
Now that's hot.