The AI era’s mega-trial delivered its first real drama, as an OpenAI lawyer sought to portray Elon Musk as resentful and double-dealing during a tense cross examination Wednesday.

Bill Savitt, OpenAI’s outside counsel, and a veteran of legal combat with Musk, called into question Musk’s motivations for bringing the lawsuit and sought to undermine Musk’s legal position that OpenAI has broken promises to him and violated its charitable duties. In several awkward moments for the tech tycoon, he corrected Musk’s recollection of events from OpenAI’s early days by reading from his own emails at the time.