What’s credible is the brain freeze aspect. The hyper awareness of your situation and how you notice details that otherwise would be not noticed, along with how fast it can happen while you are still trying to process it and react.
Part of the flight, fight, or freeze mode.
I had a traumatic event six years ago, I was not physically injured, but it gave me a taste of what PTSD is, as for months, I had a little super slow motion, full color video playing in my head every time my time was not occupied with something.
I thought about this poor hunter who was attacked by this moose he was hunting, and I wondered what that experience must be like for him.
That big damn moose face with the flaring nostrils and malignant eyes full of malice right before it gores you and stamps you into the ground. Makes me shudder.