I have been wondering this for awhile ,but is it stated how Bahamut got sealed into the binding coil?

I mean one minute he is wreaking the place with megaflare and other Fire like attacks at The Carteneu Flats ,then after the time skip I haven't notice ppl talk about how his rampage was stopped.

If he just decided to vanish into aether you would think ppl would be paranoid about him suddenly reappearing again.