Nice come back, ha ha. If she does call the cops, they can't do any thing. All it would be is "He said, she said" and it would be over.
I would have said some thing along the lines of the actual value. For example, if he threatened to kill a snake of mine that was worth $800, I would have told him I'd give him $800 worth of damage by pouring bleach in his car's gas tank. I guess we'd see how far he'd be driving, ha ha.