Routines
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D901: Check/decrement the FREEZE spell timer counter if active
Used by the routines at D7F3, D8B2 and D8CE.
Countdown timer to the end of the FREEZE spell - set to 255 when Maroc casts the spell at D8E2.
D901 LD A,($EC9C) FREEZE spell timer counter
D904 CP $00
D906 JR Z,$D90C
D908 DEC A If it's >0, the spell is active, so decrement the timer counter..
D909 LD ($EC9C),A ...and re-store.
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