In “Dead Billy Dead, Part 6,” Billy thought that any cure for his vampirism would be worth the risk involved. But that was before the living autopsy began and he learned that some things were worse than being undead. And in Part 6 of “Juarez,” a carefree Bingo has free reign while Lex is locked in the stony lonesome; Echo gives a gift; Joe and Pilar make plans; oh, and Lex’s world goes completely to Hell, too.