Must've been really big cats or a really tiny woman. It's kind of hard to believe 6 cats organized an ambush and knocked a woman down. I'm guessing the dog was antagonizing the cats and she bent down/tripped/fell/whatever in an attempt to fend them off. We have tons of feral cats in my area, and the only time I've been attacked was when I was trying to steal some babies Hands down scariest moment in my life, but that's beside the point lol.