Exxon Mobil (XOM) is now facing one of Wall Street’s least forgiving rules. You can register a fantastic quarter, like Exxon Mobil, and the stock will sell anyway. That is what happened on April 8, when Exxon, Chevron (CVX), and the rest of the energy sector dropped hard after a U.S.-Iran ceasefire knocked the wind out of the sails of the energy sector. The so-called "war premium" is perhaps out of the picture after the U.S. and Iran started talks in Pakistan, opening a transit corridor as the two sides me ...