Isn't the "Seki Seki" stone that forms the barrier specifically what causes the no flying thing?
Also the shinigami mention Quincygetsu is outside the barrier so they're safe so the no flying thing doesn't apply outside the barrier.
Also isn't Ichigo's flying the result of that special cape he wears when he shows up to the execution? We see a cord with an emblem that he pulls when he takes it off so that emblem probably indicates it's a special item. I mean that bone wing thing didn't seem very special and then "Red Bull Bone gives you wings" happened.
Also the shinigami mention Quincygetsu is outside the barrier so they're safe so the no flying thing doesn't apply outside the barrier.
Also isn't Ichigo's flying the result of that special cape he wears when he shows up to the execution? We see a cord with an emblem that he pulls when he takes it off so that emblem probably indicates it's a special item. I mean that bone wing thing didn't seem very special and then "Red Bull Bone gives you wings" happened.