The visitors thought that they had a penalty on the half hour mark as Reus went down under pressure from John O'Shea .
Instead , the referee decided to show the Dortmund forward a yellow card for diving .
The visitors thought that they had a penalty on the half hour mark as Reus went down under pressure from John O'Shea , but instead , the referee decided to show the Dortmund forward a yellow card for diving .