This is the second part of a two-part column. The first part was published on Monday.In a case about a motorized two-wheel contraption called a “hoverboard” that allegedly burst into flames and extensively damaged David and Annette Garber’s residence a few months after Annette purchased the product through Amazon.com’s online marketplace from Shenzhen Gangshen Technology Co. in China, the second task for U.S. District Judge Virginia M. Kendall was to predict how the Illinois Supreme Court would rule …