Your body is getting ready to act. It's pulling resources away from systems that are not important in the moment (like digestion, etc.) and moving them to the systems that will be required for survival.
Thinking is less important than running or attacking, so it goes. We think our brains are important, but our bodies know how to run. Thinking just gets in the way.
But, as slwsnowman40 notes, you can train yourself out of that response. Exposures are a useful tool.
I'm thinking that's really the only way , exposure training.
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