The old man was the father of a police officer who died in the line of duty. With the loss of his son, he found himself alone in his old age. When the higher-ups learned about his situation, they invited him to come and work there.
He had been on duty there for quite a few years now, having encountered numerous police officers like Kane who carried a heavy burden in their hearts. They often suffered from insomnia, coming to the shooting range for practice. Generally, he would let them in.
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