The original Sword Art Online theme plays triumphantly the SAO OGs and additional allies from ALO (including the dearly departed Yuuki’s Sleeping Knights) dive into the game, having converted their accounts to the Underworld. Their arrival allows Asuna crucial time to fall back, heal, and create a better strategy for the battle. It’s also a chance for Renly to see, through Liz and Silica, that not all real worlders besides Asuna are scary.
As Kirito’s friends and family dive in, Higa notices sudden momentary blips of activity in his catatonia. Thinking everything through out loud, he determines that despite having never made a Fluctlight of Kirito and despite the damage that has been done to his self-image, Asuna, Suguha, and all of his friends collectively represent a backup they can use to restore most if not all of what he’s lost.
Things get very technobabbly here, but nothing Higa proposes clashes with the fictional science laid out thus far. But if Gabriel Miller’s force and/or the JSDF escalate the battle, irreparable damage could be caused, so the procedure must be begin immediately, while everything is online and the source of the backup self-image (i.e. those closest to Kirito) are still diving.
Higa volunteers to go on an extremely dangerous mission into the bowels of Ocean Turtle where his scrawny frame will be able to access Kirito’s STL control panel. Kikuoka and Rinko will deploy the experimental Ichiemon robot as a decoy, while Mr. Yanai asks to join Higa, in case someone needs to take a bullet for him. An honorable sentiment, but this guy practically screams “Gabriel Miller mole.”
The rest of the episode is spent resolving the battle between Bercouli and Vecta; losing one arm barely slowed the guy down. And here, the animators decided to go for much thicker lines and bolder colors than the softer scenes with Asuna & Co. and on the Ocean Turtle. The more intense visuals befit a boss-vs-boss battle, in which every strike creates a shower of sparks and tears the earth asunder.
Bercouli isn’t fighting to win on Vecta’s terms, but seeking to kill him using his unique time magic. Once he locates the afterimage of Vecta a bit less than 600 seconds ago, it’s just a matter of waiting for the proper moment to strike. His dragon Hoshigami (the reflection of whom Vecta sees within Bercouli’s eyeball) buys him invaluable time, and he doesn’t waste it. Once he slashes Vecta’s past, Vecta’s present body shatters.
Vecta is defeated and Alice is safe (for now), and without any help from Sinon, who is presumably still en route. Unfortunately, Bercouli doesn’t survive the battle either, and is dead before Alice comes to. As she cries out in anguish, his ghost tells his apprentice and daughter she’s done well and will be okay without him. Then the Administrator of his memories (one who he notes is still warm, kind and can smile) appears and joins him on his dragon ride to the thereafter.
Fanatio can sense when Bercouli has died, and she too has a quiet moment of grief, promising him she’ll raise their daughter, still in her belly, to be a “gallant, proud human” like her father. Back at Ocean Turtle, Gabriel wakes up, gets a quick report on the American MMO forces and Vassago, then has his personal “Subtilizer” account converted. No doubt he’ll return even stronger than Vecta was—and be a prime final boss for Kirito, if Higa is able to revive him.