Finally contacted Cat3's original owner re looking for a new place for her to be. For every good interaction we have, there's a 7-inch long scratch on my forearm or deep bruise on my hand for when she decides to murder me. For every time she ignores Cat2 outside her room, there's a time when she's running full tilt into the baby gate snarling at him for doing the same thing. I think Cat3 just needs a home w/o other cats.