Borussia Mönchengladbach ended Bayern Munich's 100 percent start to the season, earning a 1-1 draw at the Allianz Arena with the aid of an incredible 19 saves from keeper Yann Sommer. The highest total on record for a single Bundesliga game – and a performance meriting closer, in-depth inspection. What particular qualities and strengths did the 33-year-old Swiss shotstopper bring to bear, in order to repel so many Bayern attacks? Our analysis has the answers.