Just got done duoing with a 75blu/nin and a 75sam/dnc (me). It got pretty hairy a couple times, due to me getting petrified cause I was slow to turn, got me down to about 1/4 and the blu down to ~1/2, but we pulled it out. Blu basically solo'd the last 1/4 of him due to me being petrified, then with a sliver of HP left on the dragon, petrify dropped, and I Gekko'd for the kill. 1/2, helm actually dropped on both kills I was part of, but I lost lot on the first one.
Thanks, Illistyl, it was a fun fight.