User blog comment:Xilinoc/Ch. 567 (Rukia be like "I ain't even scared though")/@comment-5693502-20140205150657/@comment-26420452-20140206060815

She says her body temperature is below zero, so she's talking in degrees Celsius. At this state, the molecules of her body are far from stopping moving, they're just moving less. So if fear could go through anything inanimate it should have gone through her.