https://www.chess.com/variants/spell-chess/game/62991935/9/1
even if black moved any other piece, the king would have been captured.
Alternative lines include Black setting the freeze spell on c6 after 4…Bd7, then White can play a passing move, but must set the freeze spell at c7 to liquidate Black’s possible defenses.
https://www.chess.com/variants/spell-chess/game/62997881
https://www.chess.com/variants/spell-chess/game/63012263
https://www.chess.com/variants/spell-chess/game/62991935/9/1
even if black moved any other piece, the king would have been captured.