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Emergency preparedness is commonly built around the assumption that individuals will recognize danger, recall established procedures, and act rationally under pressure. Research in crisis psychology, however, suggests that acute threat frequently produces the opposite response: freezing, cognitive paralysis, narrowed perception, impaired working memory, degraded decision-making, and fear-driven overreaction. This paper examines the psychophysiology of acute threat and argues that the principal behavioral challenge in emergencies is often not mass panic, but the inability of otherwise capable individuals to function effectively when arousal overwhelms deliberate reasoning. Drawing on research in stress physiology, recognition-primed decision-making, stress inoculation, police performance, martial-arts training, and use-of-force behavior, the paper evaluates whether repeated exposure to realistic, controlled adversity can preserve performance under extreme stress. Particular attention is given to combat sports and grappling-based training as methods of repeatedly exposing participants to fear, physical pressure, loss of control, and adverse positions while requiring continued goal-directed behavior. Evidence from experimental police studies and field observations suggests that such training may improve composure, situational awareness, defensive performance, and force decisions under anxiety. Building on these findings, this paper proposes the Controlled Adversity Hypothesis: that the protective effect of combat training is driven primarily not by strength, fitness, or aggression, but by cumulative exposure to controlled experiences of losing while remaining functional. The hypothesis generates falsifiable predictions involving dose-response relationships, differences between combat disciplines, physiological mediation, and sustained training frequency. The paper concludes that continuous, control-based, adversity-rich training deserves serious investigation as a component of preparation for professionals responsible for protecting others during critical incidents, while emphasizing that the proposed mechanism remains experimentally unconfirmed.