User blog comment:Xilinoc/Ch. 591 - Marching Out the ZOMBIES 2/@comment-24282510-20140731035626/@comment-11051098-20140731121654

His Bankai only creates the ice that makes up his wings and tail and covers his right arm. As previous comments say, the blade itself does not change.

Speaking of blade - his Shikai was indeed cut in half by Burner Finger 2, and when he released his Bankai after he got it back, the ice covered up his wounds, and also created an ice extension for the part that was cut off.