Hunter's best friend for life, they're like brothers. Ride together, die together. Jack is bright and loveable but fucked up on drugs, just like Hunter.
Hunter convinces Jack to help him rob Sneaky Pete to retrieve his mother's jewelry that he'd traded with him for drugs. When they execute the robbery, they end up stumbling on a lot more than the jewelry; they find his entire inventory of drugs and profit money. They take everything not realizing that the money and product actually belongs to RL.