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8D6D: Count down the low nibble of +$02
Used by the routine at MOVE_PLAYER.
Does nothing once it reaches zero, so a creature that uses it gets a delay that expires and then stays expired until something sets it again.
TICK_LOW_NIBBLE 8D6D LD A,(IX+$02)
8D70 AND $0F
8D72 RET Z
8D73 DEC (IX+$02)
8D76 RET
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