What do China's current financial slump and the deadly explosion at a chemical plant in Tianjin have in common? They highlight the blurred boundaries between business and politics which in this case led to tragic consequences: a fireball in a residential area that could be seen from space, more than a hundred dead, and lasting contamination to nearby homes and waterways. It's the biggest man-made disaster on Xi Jinping's watch. How will Tianjin impact his presidency and his nation?