Nope. Just to rule out the thought, are you SURE they are male and female? The description just sounded like the behavior of a lesser male when he's been dominated. They'd "run" but there's no where to go in a cage. That would be the first thing I'd check. I've never had a male constrict a female, or not to the degree I'm picturing from your description. I've had them on top of females, full body clenching, but never wrapped entirely around them constricting.