My cats both go into an almost frenzy if I gently pat them on the low part of their spine. They both seem to like it but I feel like it gets them wound up. Moon will turn his head and meow after a few seconds but, at the same time, he is purring. If I continue, he will bite my ankle (if he is laying on my legs) or turn to even bite my hand (like play biting but still). Bean sticks his butt up in the air. So...I'm wondering if your cat is also just acting "frenzy like"