That's only in case he can't get financing. There's no option to pay $1B and walk away. Twitter can sue to force him to complete the deal under the contract the

That's only in case he can't get financing. There's no option to pay $1B and walk away. Twitter can sue to force him to complete the deal under the contract they signed. However I suspect the lawsuit to be settled rather than drag on for years. Probably he'll buy it at a reduced price or pay a larger termination fee to walk away.