Elon Musk appeared to challenge rival billionaire Mark Zuckerberg to a “cage match” Wednesday—a prospect that Zuckerberg, who has recently been working out with religious fervor and competing in jiu-jitsu tournaments–seemed more than ready to accept. The Facebook founder, 39, posted on his Instagram story an image of Musk’s challenge, with the brief response: “Send Me Location.” The social media spat has been bubbling up in recent weeks since reports emerged that Zuckerberg is experimenting with a Twitter competitor—and said that users just want a version of Twitter that’s “sanely run.” When reached by The Verge, a Meta spokesperson said of the prospect of an actual fight: “The story speaks for itself.” Musk didn’t seem to be denying it either, replying to a reporter’s tweet about the saga: “Vegas Octagon.” He also added jokingly: “I have this great move that I call ‘The Walrus,’ where I just lie on top of my opponent & do nothing.”