1:20 Omfg, I believe my hack of FE6 ran into this EXACT problem of some bosses showing healing animations even after being defeated. Thought it was just something specific to messing with FE6's code but, apparently, it can also happen in all other GBAFEs then lmao.
Whenever I go into the FE rabbit hole, I think about this video purely from Lyn having 77 Con from when I watched it years or a decade+ ago. But I can never find it since googling with terms like "77 con lyn" don't work. Today this appeared at the very top of the suggested videos when I was watching a different FE video, and I just knew it'd be the one.
Honestly something similar happened to me in Lyn Hard Mode where they remove the forced-ness of the tutorial. Bandit got a 30~ hit through and killed Lyn.