I'm really confused. I've watched that flash twice and read the thread, so it's not all bad... Anyways, let's recap!
Jade dies due to barbasol explosion (a consequence of John's wallet getting looted). Bec Noir places her on her quest bed, she ascends to Godtier, becoming her dream-self, who, due to her prototyping, is her sprite. She now has space bending powers (in keeping with her title), although it's unclear whether or not becoming a sprite has improved those powers. She flies away on a Prospit battleship, gathers up the battlefield and the 4 planets, and escapes through a 4th wall, thus fulfilling the task to save the denizens.
John successfully initiates the scratch, is a tremendous badass, and is then whisked away to safety by Jade.
Dave, Rose, and the bunny are on Derse's moon with the tumour liberated from John's wallet. The tumour, deployed, is actually a device that seems to mix the two universes together. They also find their quest beds. The deployed tumour is timed, and when time runs out, it detonates, killing Dave and Rose, resulting in their ascension, but it also creates the green sun - in both sessions simultaneously. This seems to be an anchor between the two sessions.
Bec Noir, angry at all of reality, destroys the kid's Bilious Slick and thus begins ending the universe. He also goes and hides inside a lotus flower in the frog temple. He arrives about ten seconds after the White King, apparently. All the exiles are slaughtered by Bec Noir after his arrival (save PM), including WV for his uranium, which Bec uses to power an appearifier into the Troll's session. This is how he managed to arrive in their session and slaughter them all.
Aradia and dream-Sollux are waiting for the green sun. Real-Sollux uses his eye-powers to launch the troll's asteroid towards the green sun. Bec Noir is distracted from killing them due to the arrival of PM, who is now wearing the queen's ring and is suitably powered up.
Doc Scratch, dead at the hands of Hussie, seems to have gotten the last laugh by misleading Rose about the tumour - it won't destroy the green sun, but create it. Cal may also be channeling Doc Scratch, and Gamzee seems to be under his influence. "Suckers" in Scratch's text from Gamzee.
Spades Slick kills Snowman.