Our neighbor has a gray cat who spends as much time in our yard as her yard. It is rather territorial, and has little tolerance for other cats intruding in “its” domain.
The other day a black cat came into the yard, leading to what looked like a possible confrontation in the making. Gray cat stalked the black cat over the approximate 50 feet distance between them in full predator mode: crouching and moving forward in slow hunting style.
Fortunately the black cat moved on when it saw gray cat approaching. The episode ended without it coming to blows. That is not always the case, as we have seen and heard some pretty loud cat fights in the past.