Lynn Seiser (SeiserL) wrote:
IMHO, a quick hip/butt check can move their center and begin to take their balance. It can also be like an atemi that changes their mental focus from their hand to their butt making less resistance to the kote-gaeshi.
I don't think this is what she's seeing but I understand your point. It's also useful in situations where you need to get uke to arch their back.