Zimbabwe's former Vice President -- Emmerson Mnangagwa -- could be in South Africa. It's believed he fled the country on Wednesday. Mnangagwa has fallen out with President Robert Mugabe. And he's vowed to defy the long-standing leader. Meanwhile, the ruling ZANU-P-F party has endorsed Mugabe's wife, Grace, to become the next vice president. President Mugabe fired Mnangagwa on Monday, accusing him of disloyalty.