I looked at the game and you should've been able to freeze the rook, maybe chess.com glitched or something.
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In this game at the very end, when the rook takes my rook, and freezes my knight, I couldn't freeze his rook back! Am I misunderstanding a rule, or was this just a glitch. In the analysis board, only NOW can I freeze his rook. Makes me think this was just a glitch. (During the game the freeze button appeared clickable, but when I clicked on it, it didn't react)
https://www.chess.com/variants/spell-chess/game/77586567/79/1