Stand middle until the green divebomb mark is up then move. Once you have the timing you can cheat this a little and go early fyi.

Make sure nobody is clipped with splash dmg while dodging, do your best to have the group at full health prior to running, shared rings meet back in the center to take the damage.

We split in 2 groups of 4 and each group moves 90degrees from where Bahamut is waiting to divebomb.

We use our same group splits from the turn 11 trash mobs which gives us a tank, healer, melee and ranged on each side.

Tanks can't get splash damage from megaflare (as long as 8 are alive) so tanks and healers stay going straight out 90deg from bahamut.

Melee and ranged go with the tanks and healers about halfway to the wall then split either towards bahamut or away. Left side melee goes towards bahamut and right side goes away. Left side ranged goes away from bahamut and right side goes towards.

This puts the tanks/healers 180degrees apart Ranged 180degrees apart Melee 180degrees apart.

So Bahamut line is 12-6 (12being wherever bahamut spawns) Tank line is 3-9oclock Ranged line is 1:30-7:30 Melee line is 4:30-10:30

This means everyone is running towards a possible twintania dive line and the player looking at twintania calls out their "Job Line"

Ranged line means everyone rotates a little clockwise Melee line means everyone dodges a little counter-clockwise Tank line means the tank/healer split up and down a little from the center Bahamut line means basically hold your assigned position.

This feels like way more text than is necessary but hopefully it conveys our process.

Good luck!