Elon Musk has sold $6.9 billion of his Tesla stock ahead of a looming legal battle that may force him to buy Twitter. The capricious electric-car mogul backed out of a $44 billion deal to buy the social media company in July, but Twitter sued Musk demanding that he make good on its terms. With the trial set to take place in Delaware in October, the world’s richest man appears to be making sure he has enough cash ready to go if the case doesn’t go his way. “In the (hopefully unlikely) event that Twitter forces this deal to close *and* some equity partners don’t come through, it is important to avoid an emergency sale of Tesla stock,” Musk tweeted Tuesday. He also confirmed that he had finished selling Tesla stock and that he would buy shares in his company again if he doesn’t wind up having to buy Twitter.