Tesla Inc TSLA chairman Elon Musk has fueled his fiery rivalry with even more fuel Fisker Inc FSR chairman Henrik Fischer. What happened: A new Teslarati report pointed out that DeLorean executives are being sued by Karma for pursuing a separate company. In response to the article shared on Twitter, Musk accused the Fisker CEO of doing the same thing to Tesla 15 years ago. "How ironic, that's what Henrik Fisker did to Tesla in 2007! Karma is a…" Musk said Wednesday via tweet. Karma filed a lawsuit against DeLorean executives last month. The company claimed a group of former employees was asked to find investors to develop electric vehicles, but instead pursued outside ventures. Executives claimed they would be allowed to start a new company if necessary.