An example of this would be firefighters who answer the calls for car wrecks and people dying. They appear to be cold as they go about their jobs of trying to save the injured or keep those dying alive long enough to get them to a doctor. Fact is they are not cold or heartless. They have trained themselves not to get emotionally involved for if the do they are of no help to the people who need them. Once they get back to the fire station then the emotions come out.
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