Because we are not animals, and do not have animal weapons, we must use certain techniques and points on the human body as our weapons. Once we have learnt this, we then allow the inner mind to take over and do the rest. We have certain body postures to help us to get into this mode and we have the learned 'way of doing things' from our forms, katas, kumite and other two person training methods to give us the physical requirements to keep up with what our reptilian brain is trying to have our body do. If you try to use techniques, then you are being human, and humans cannot fight. Techniques are human things, dogs do not have techniques, a shark does not have technique, an eagle does not have technique, only humans have technique and so we are beaten when we have technique.
Animals just be.
They are just doing what they have been told to do, we, do what we think we should do, we try to use techniques and then we lose the ability to adjust our body to what is happening to it. If we are attacked to the face, we immediately try to cover up using our hands. A dog does not have hands and so it bites our nose. We should make our hands be like the dog's mouth, they should bite the attacker's nose off, but we cover up, we do not wish to fight, we are not animals. When we become like an animal, we do what has to be done and don't even think about it after.