Dan PrimackDeel CEO Alex Bouaziz. Photo: Vaughn Ridley/Sportsfile for Collision via Getty Images)The legal battle between HR software unicorns Deel and Rippling escalated on Friday, with Deel suing Rippling for alleged defamation, libel, and deceptive trade practices.The big picture: This conflict gets more personal with each court filing.Catch up quick: Rippling initially sued Deel last month, essentially claiming that Deel CEO Alex Bouaziz had hired a spy inside of Rippling.That individual, Ke...