Bundesliga leaders Union Berlin wasted a penalty as they crashed to a surprise 2-1 defeat at Bochum on Sunday and now face the heat from the chasing pack led by champions Bayern Munich. The victory – coupled with Schalke’s heartbreak in a late 2-1 defeat at Hertha Berlin – lifted Bochum off the bottom of the standings at the expense of Schalke. Philipp Hofmann headed Bochum ahead in the 43rd minute off a corner-kick, awarded after Union goalkeeper Frederik Rönnow had tipped Jordi Osei-Tutu’s dangerous shot over the crossbar. Osei-Tutu hit the top of the bar just after the hour but fighting Boc…