What actually happens
Under stress, your biology takes over.
When it does, any of this can happen: vision tunnels, thinking jams, hands fumble, and the skills — drilled a hundred times — are not there. That's fight-or-flight, your survival wiring, doing its job at the worst possible time. It is human biology, not negligence, but the costs run high: discipline, criminal and civil liability, injuries, and lives.
Officer safety, de-escalation, and sound tactics all begin with recognizing when your own biology is working against you, and training to manage the response.
Grounded in decades of human-factors research on performance under stress.