I like it. I like it a lot.
* You'll note that the cat not only attacked the dog but then chased it to the edge of the property.
That makes two of us. The entire action, including the 'shortcut' the cat took to follow up on its first charge was nothing shy of decisive.
It's not that I never heard of cat territorialism, I just haven't seen obvious examples of it myself. Our cats (neutered males) are indoor/outdoor cats, and prowl the neighborhood, a.o. keeping the rabbit, mole, vole and field mice populations in check. The older one (13 y) a red tabby at just about 10 pounds, and a younger (4y) grey/yellow tabby of about 18 pounds, of which our vet suspects a healthy dose of Maine Coon in his genetic make-up. When someone walks up to the front or back door they freeze, and when the doorbell rings or the door opens they scramble toward the basement in a mad, cartoon-like dash.
But they aren't shrinking violets either. They occasionally fight/play among themselves, and otherwise get injured outside, as measured by gashes in skin/fur, chipped canines & the like. We whistle and call before we go to bed to get them indoors, and they almost always respond and return home. If not, there are ample hiding places around the house, a preferred one of which is on top of the open garage door, accessed via the cars parked there. After rainstorms we briefly wonder what the cat prints are doing on the windshield.