this ties into my dark forest wins au, which im writing as a fic! u can start reading here https://www.deviantart.com/jigsocks/a...
this videos really hard to follow so imma explain it in the desc here

0:00 0:07 is mostly the canon events of the books, sol manipulating blackstar into abandoning starclan, until blackstar chases him out. blackstar then finds him later and apologizes. they make up and are lovey again
0:07 0:15 sol is snooping on jayfeather and dovewing and overhears them talking about the battle with the dark forest. he watches from above the moonpool in excitement.
0:15 0:22 blackstar is killed in the battle. the clans flee to where sol is staying, rowanclaw tells him blackstar is dead, and in shock sol runs off, jayfeather following him
0:22 0:39 sol sleeps at the moonpool to see blackstar. when blackstar meets him, sol apologizes violently for manipulating him when he was alive, since he realized he really lost his chance to say sorry while he was alive. blackstar finds it hard to watch the cat he loves so guiltridden and miserable, so he sends him into a flashback. jayfeather watches.
0:39 0:46 a lovey flashback. blackstar and sol are playing in the creek that feeds into the moonpool and the lake.
0:46 0:58 sol wakes up and runs away, into the same creek from the flashback. he's griefstricken and mildly hallucinating, remembering blackstar telling him he loved him and such. he just misses him in general
0:58 end jayfeather confronts him in confusion, and they kinda just stare at eachother

yeah sorry this au has some blackstar/sol content cuz im emotional and its a cope ship lmao