Michelle MarchanteAn “altercation” on the patio of a Miami-area bar sparked a lethal firefight between police and an armed patron early Saturday, according to authorities—who noted that the local department had conducted a mass shooter drill at the same location last year.Local police addressed the press outside the Martini Bar, where they said a dispute around 3:30 a.m. attracted the attention of a security guard, who one of the feuding patrons promptly shot and killed. This set off volleys of