Welcome to another general discussion thread! Feel free to use this thread to talk about things you have watched recently, questions you have, or recommendations you want to give!
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It’s been, I think, four years since my last rewatch, so it’s hardly surprising that my memory is fuzzy. I made a quick check of Wikipedia in an attempt to restore some details to my sieve-like brain.
spoiler
Tomiko (or someone allied with her) seems like the most probable person to have dealt with the Tainted Cat, since she’s shown throughout not to want the children eliminated if possible. (Not that she could save Shun, but he was too obviously out of control, whille Mamoru seems to have been more of a borderline case.)