Casino mogul Sheldon Adelson found himself answering questions in a Las Vegas courtroom last week about what he knew about a plot to behead employees in Macau and if Chinese government promises were broken as Las Vegas Sands Corp. developed properties on the lucrative Cotai Strip. The billionaire chairman of Sands and Venetian resorts in Las Vegas, Macau and Singapore testified Tuesday at proceedings that mostly focused on jurisdiction for the wrongful termination lawsuit filed by ousted Sands China Ltd. chief Steven Jacobs.