It was a drug buy that went sour and it ended with Jamario Akeem Warren shooting a man and being shot himself. Warren, 30, of Parish Land, Christ Church, was in the No. 2 Supreme Court yesterday where he admitted he used a firearm without a licence to do so; that he unlawfully and maliciously wounded Robert Jamal Walcott; that he used unlawful violence and his conduct would cause people …