Several possibilities here that I can think of, and I'm no finance expert.
1. Creditors who backed Twitter buy call in loans, take ownership of collateral (Tesla gets some new shareholders, don't know if EM loses majority stake).
2. Creditors write down and refinance Twitter loans, take loss.
3. X closes shop or declares bptcy, creditors take control of X.
4. EM pledges more collateral (Tesla shares?) and the chaos continues.
Or something I am unqualified to imagine...