Here's my attempt to break down their actions.
Turn 1
Moving 2 spots down is the only way for Eirika to get closer to Spring Camilla(whom has triangle adept)
Azura gets priority because of her assist Sing skill and uses it while getting closer to Roy.
Eirika tries to move closer to Camilla, however she chooses to go right instead of down since it puts her in range of more favorable fights.
Moving 2 spots left is the best way for shareena to get closer to Roy.
Julia moving down 1 spot is the fastest way to reach Subaki.
Turn 2
Shareena has priority because she can use a rally skill on someone in range of an enemy.
Azura again gets priority because of Sing.
Subaki is in Eirika's attack range so moving towards camilla no longer has priority. However she would do little to no damage to him, so she prioritizes using her assist skill on someone else who is range on enemy(julia)
Julia attacks Roy because he is range.
Shareena moves down as its the only way to get closer to Roy.
Turn 3
Eirika attacks Roy because he is in range.
Azura uses wings of mercy and attacks Camilla whom she does no damage to????? Instead of attacking Shareena whom she can do damage to or using Sing on Eirika?????
Sorry I don't know what Special Eirika has, but Roy has Pavise so that might impact Azura's choice not to Sing. But attacking Camilla is a head scratcher.
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