The Pre-Crisis version of Hal Jordan was inspired to create his oath after a series of adventures in which he developed new ways to detect evasive criminals: in the first adventure, he used his ring as radar to find robbers who had blinded him with a magnesium flash; in the second, he tracked criminals in a dark cave by using his ring to make them glow with phosphorescence; finally, Jordan tracked safecrackers by the faint shockwaves from the explosives they had used.