Hey, I just had the same situation but I got a solution I guess, screen record the battle, then cut the recording to the part the song starts and ends, use CapCut or KineMaster for it, idk, then go to your file explorer, preferably use Zarchiver, go to the edited video, press "change name" button and change the .MP4 (video format) to .MP3 (audio format) and there you go, a OST that basically doesn't exist yet, I did that and worked!
Gryphus16
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