Supernaturally Calm During a Home Invasion

I was home alone when someone broke through my back door at two in the morning. What I remember most is not the fear — which came later — but the strange calm that descended on me in the moment. I hid in my bedroom closet with my phone. I should have been in a full panic. Instead I felt a steady, settled quiet that I had no natural explanation for, and I was able to think clearly and act correctly — called 911, stayed silent, gave good information. Police arrived within minutes and apprehended the individual in my backyard. Afterward, when the adrenaline finally processed, I shook for an hour. But during the event itself I was more clear-headed than I have ever been in any emergency before or since. The officer who took my statement told me my composure had likely helped with the apprehension. I have no personal attribute to credit with that composure. I know what my anxiety looks like under pressure. What I experienced that night was not me.