Very rarely foxes attack cats

The images a fictional depiction for a Warrior Cats role-play group on the Internet. But the truth is that very rarely foxes do attack cats in the urban environment. Normally they get along benignly and mind their own business but on occasions attacks do take place. Often it depends upon the confidence of the fox and the vulnerability of the cat. But sometimes it could simply be just the circumstances. For example, a cat may be inadvertently ambushed by a fox because they bumped into each other.