Lemoyne, you are correct. Unless you are talking about something a lot bigger than a hunting round bullets do not knock animals off their feet. Perhaps in the movies they do. What the people making the movies don't know is that if the bullet lifted a person off their feet or knocked them over the shooter would also go down because for every action there is an equal and opposite reaction. If you hit an animal in the right place it will get real sick and fall down, sudden loss of blood pressure, severed spine etc. Knock down power is a term we shouldn't use but most people do.