Cats can be extremely territorial - one of mine once attacked a dog that wandered into our backyard, so it can happen. I would assume the reason it happened is because the dog wandered into the cat's territory (aka someone else's property). Siamese cat vs. pit bull is an unfair fight to say the least.
Whoever that guy is, his dumb ass should not be allowed to own animals if he's going to let a big, strong, proven aggressive (by this incident) dog wander into other people's yards. Next time it could be someone's child.
Ugh. Of course there are questions of leashes. But as I see it the underlying driving story is one of race and menace and fear. Thats how you get a police report out of an animal fight.
Whoever that guy is, his dumb ass should not be allowed to own animals if he's going to let a big, strong, proven aggressive (by this incident) dog wander into other people's yards. Next time it could be someone's child.