Just before the MagiMaster battle's triggered, the hero sprite faces right, and then up so as to face MagiMaster in a turnaround motion. Seeing how MagiMaster only pops out as you try going South, it should make sense, no? No. Because while MagiMaster makes his way towards your party, you can still move around. So whether the hero sprite's facing West, North or South, the game still makes it face East then North even though it doesn't make sense anytime it doesn't face South (or, to some extent, East).
Just before the MagiMaster battle's triggered, the hero sprite faces right, and then up so as to face MagiMaster in a turnaround motion. Seeing how MagiMaster only pops out as you try going South, it should make sense, no? No. Because while MagiMaster makes his way towards your party, you can still move around. So whether the hero sprite's facing West, North or South, the game still makes it face East then North even though it doesn't make sense anytime it doesn't face South (or, to some extent, East).