That's what my Elvis does with Baby Su. She doesn't run, he doesn't chase her, but any flight type movement from her and he's off like a shot, absolutely ignoring my interventions.The way it’s been described to me is a very severe case of redirected aggression, due to being overstimulated by a stimuli that they either can’t get to (seeing outside cats, DEFINITELY one of her triggers) or the nervous system having an overreaction due to general anxiety and instead of hiding to going on defense, the cat goes on offense. It could very well be what you’re saying though. But wouldn’t there be some kind of sign of a seizure, even if it’s very subtle and small? I’ll have to google it as well and read up on cat seizures. But last night for example, her behavior when it happens reminds me of those hunting dogs that point and go on high alert, and then head for the source. She stands to attention and actively seeks out what she thinks is the threat and then will attack anything that’s alive near her, even if it’s not the threat