Translation of the above spoilers by spacecat at BleachAsylum:
Azure Peacock isn't a bankai it's just the real name of the zanpakutou.
The zanpakutou has a favourite colour which is azure.
It hates light purple. If it is called by "light purple peacock" it will
pout and only release itself half way.
The 11th division is really fierce and focused on strength so he doesn't want to show his kidou based zanpakutou as he doesn't wish to be called a coward. Since the thorns covered them up he was hidden so used it and won.
TN: The first part is exactly the same info as the other spoiler but the other is more detailed so I will ignore this first bit.
The scene switches to Hisagi's fight. His oppenent has been using the power level of only a 5th seat shinigami but is becomming angry. He thought that Hisagi had no ability in regards to measuring power level so he was only using that level (below captain level) thinking Hisagi wouldn't realise. He starts to cut himself and gradually becomes stronger.
Scene changes to Kira's fight.
His opponent attacks the barrier he had made to defend and it cracks. He flies up in to the sky like a bird. He says something like the feathers are so heavy and then he uses the feathers to attack.