Routines
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BA08: Walking guard heading +X
guard_E BA08 LD HL,$0002 dX = +2; not blocked along X, keep going
BA0B BIT 0,(IX+$0C)
BA0F RET Z
BA10 LD HL,$FE00 blocked: dY = -2, and turn
BA13 JR next_guard_dir
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