Musk made an unsolicited, and what seems to be a non-investment choice, purchase of almost 10% of the shares and wanted to join the board. As far as I can tell, the board made his board seat contingent on Musk not buying more than 14.9% and Musk said no, and a few days later offered to buy the company outright. Now Twitter is taking moves to prevent a hostile takeover. That sounds like a hostile takeover to me.