Lars and Off Colors were actually on Earth at the time of Escapism. They and the B-team CGs (including Greg) 'capture' the human-zoo space station (essentially just showing up and explaining the situation to the already-mutinous staff), unbubble all the Rose Quartz Gems and form an army. They teleport/'warp' the whole station into Homeworld orbit (remember: it's all literally magic, there are no rules) and issue formal demands for the release of Pink Diamond and her attendants of face invasion.
There's a big poorly animated 'space' battle with Rose Quartzes literally jumping out of the space station onto passing 'fighter jet' ships (remember: it's a kids show), Homeworld begins to descend into total chaos of War. Steven and Connie are freed by the accidental destruction of their tower, and lost amidst the chaos. Blue and Yellow are seen fighting (and not particularly 'winning'), but White remains absent, holed up in her torso. Steven and Connie, appalled by the violence, reason on heading there to try to talk to her and somehow get her to end this.
they get in somehow (probably after meeting back up with the rest of the team briefly), and meet with WD. She is in a breakdown and tells Steven that this is the end of Homeworld, which she knew was inevitable from the moment she saw him fuse with Connie, but couldn't have imagined would happen so quickly. she's wryly relieved for the immediate turnaround. Steven talks her down, explicitly saying something like 'it's not ending, just changing'. All four Diamonds fuse (camera cuts away to not show the fusion, which is inside whites torso) and magically end the fighting (scene of the humans reacting to all the gems, including CGs, going still and looking towards whites torso, then kneeling).
Steven and Diamonds all together exit whites torso to face the crowd of kneeling gems amongst the smoldering ruins. uncharacteristic screen text overlay 'Era 3'.
Connie/Greg/Lars run up, ask Steven 'What next?', credits.