Jack was unable to use lethal force, and Lobo beat him up, took his ring finger, and left him for dead. Later, Chance learned a lesson in humility when he was beaten in combat by intergalactic bounty hunter Lobo on a routine mission for L.E.G.I.O.N. Also, his activities were confined to his own sector, and his ring would not work anywhere else.
They agreed that he would be able to police his area the way he needed to, if he allowed himself to be subject to periodic review of his usage of powers. Although he was a bad man, he was a good bad man, and he was their bad man. He refused the Guardians' terms, and told them that his way was the only way a sector like that could be patrolled. After Jack gunned down the man who killed Pathavim, he was taken to Oa forcibly and subject to court martial for murder. the first Lantern ever to do so successfully in his Sector. Chosen as the nearest sentient who was both honest and without fear, he began tackling the massive infestation of crime. Chance of Garnet was chosen after his predecessor, Pathavim Seth-Ottarak, was brutally gunned down in the streets by one of the planet's self-proclaimed Anti-Lawmen.
