Operations don't come any tricker than this. A surgeon in Colombia has removed a live grenade from a soldier's leg. It had been lodged there for four hours and could have exploded at any time. Philip Chadwick reports. video.news.sky.com/skynews/video/World+News/1313696v_Live_Gr ;lid=VIDEO_1313696_Live+Grenade+Removed+From+Man%27s+Leg&videoCategory=Latest+Video"