Mine would have just run it over, and then stopped a few feet later, and looked back, like, "Hey. Wait a minute. Was there something at the top of the stairs just a second ago?" "Zoomies" are subject to being conducted at any time. His attitude towards the world is, "If you're not a hooman, with thumbs for getting fud, opening doors and throwing balls, or hands for belly rubs, you can be safely ignored during 'zoomies'."