Routines
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B9FB: Walking guard heading +Y
guard_N B9FB LD HL,$0200 dY = +2; not blocked along Y, keep going
B9FE BIT 1,(IX+$0C)
BA02 RET Z
BA03 LD HL,$0002 blocked: dX = +2, and turn
BA06 JR next_guard_dir
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