One of my four cats is very skittish, and I can completely understand how this happened. Any time he gets startled, he peels out, scratching whatever is in his path (usually me). He's been startled by the sound of a door closing when he was laying on top of the couch - he took off running down my head, shoulder, and chest, scratching me with his back claws the whole way. My thighs have been scratched countless times. He likes to lay in my lap and if he's startled by one of the other cats or the dog, he takes off and scratches my thighs. Yeah, he's nuts, but we love him.
I never thought about the soft paws. That's a good idea.