You're right about the wording being tricky. The part about "listening for the right signal" is key, but I'd add that the horse's whole body tells you more than just the hoof. If you only focus on the foot, you can miss a problem higher up in the leg or shoulder that's causing the bad stance. You have to check the whole animal, not just the part you're working on. Otherwise you're just fixing a symptom and the problem comes right back.