Dog's Heart Rate Starts to Slow, and I Should Have Done That!

Duck's behaviour disturbed him as a father, but it also disturbed him as a neuro scientist who thought he had a good handt oan how the brain worked. How does this happen, that you can stantly do this aggression without even being aware, and it's all unconscious? I wanted to understand how that worked at a neura science level, what's going on in the brain? The question, again, was, why evolution would preserve systems in the brain that cause us to act with unthinking haste and violence,. haste and violence that can place our own lives at great risk. Dog eventually realized that the answer lay in the question itself. It was all about speed....