I feel like you shouldn't even need a lawyer for this... just make sure you communicate to him in writing that nothing he did was legally binding, there have been no new shares issued and he has no control of the company.

If he decides to sue, _then_ you can get a lawyer. But IMO it's just a waste of money otherwise... do you need a lawyer every time a crazy person does something delusional?

You definitely need to fire him though. And if you don't want to take over operations, then you either need to find someone else who does, or go along with this crazy guy's plan (because otherwise _nobody_ would run the company right?).