As MNK I pop Mantra when the Gaseuos bomb target appears just after the first dread as healers are casting Medica 2 and Succor. Gets everyone topped up fine. The SCH has time to pop cleric stance and do some dottage on Avatar as theres a lull in healing required and WHM can easily keep tank topped up. Then you can rotate Mantra between MNK and BRD.

But yep, homing missile, one person take it away from the party, healers can Adlo and Stoneskin them.

But GL on turn 8, is a fun fight.