twomp, this is the sound of Isane Kotetsu paws, while trying to be as quiet as possible so as not to be seen like that, all because after experimenting with an artificial bankai, making her a big fat anthropomorphic polar bear. aside from the broken sandals and broken socks due to his huge paws, his shinigami uniform still fits him despite the rolls of animal fat he has acquired.

Isane: E-EH! What happened to me! I'm a polar bear, and also a very obese one.... Oh... I hope no one sees me in this state....