BAYERN Munich struck twice in the second half to earn a 2-0 win over Cologne and bounce back from two straight league losses ahead of their Champions League return leg against Arsenal next week. With Bundesliga leaders Bayer Leverkusen 13 points ahead and poised to wrap up their first league title with a win over Werder Bremen on Sunday, Bayern's only hope of silverware this season rests with the Champions League following their 2-2 draw in the first leg in London. They suffered a serious injury blow, however, with winger Kingsley Coman taken off in the 50th minute and ruled…