“’Bills Mafia travels pretty deep,” he said on the eve of his AT&T debut. “I don’t know how they do it, but they’re everywhere and nowhere at the same time.” Thursday’s round proved the point. As Allen and his group approached the No. 16 green — the other amateur was former Arizona wide receiver Larry Fitzgerald — one spectator wearing a Bills hat and holding a can of beer shouted, “Let’s Go Buffalo! Bills Mafia!”’