The best litigators tell stories. Two masters are at work this week spinning opposite tales in a Dallas federal courthouse in a huge intellectual property fight over virtual reality technology that could revolutionize the $90 billion video game industry—and some say even the world.

On one side: Facebook Inc.–represented by lead counsel Beth Wilkinson of Wilkinson Walsh + Eskovitz.  No less than Mark Zuckerberg himself testified on Tuesday. The Facebook CEO strongly defended his company’s 2014 acquisition of Oculus VR for $2 billion (though the plaintiffs claim the true price tag is closer to $3 billion).