In an alternate universe, Bluenote was taken down by Makarov's last bit of power on Tenroujima, leaving Gildarts pretty much at normal.
Gildarts arrives at the same time as Laxus to try to take down Hades (team Natsu are still battle-worn).
Can Laxus and Gildarts together pull it off?
After 7 minutes, team Natsu (Natsu, Erza, Grey, Lucy, Wendy) regain all their power and re-join the fight.
Hades has full access to all his power, and his heart cannot be disabled/destroyed.