Lowly Bayer Leverkusen scored five times in 30 second half minutes on Sunday in a 5-0 demolition of Union Berlin who have lost the Bundesliga lead for good to champions Bayern Munich. Union slumped to the joint biggest defeat of a league leader since 2000, sharing the fate of Borussia Dortmund who had crashed 5-0 in Munich in 2019. Robert Andrich opened the scoring in the 46th when he volleyed home off a corner-kick at the far post against his former club. Moussa Diaby grabbed a 56th and 58th minute brace, the first after Union goalkeeper Lennart Grill, standing in for injured Frederik Rönnow,…