I'm not a lawyer and don't know what I am talking about, but even if the other co-founder fired them, couldn't they file a wrongful termination suit since them

I'm not a lawyer and don't know what I am talking about, but even if the other co-founder fired them, couldn't they file a wrongful termination suit since them being fired at this point would clearly not be due to performance, but due to the co-founder wanting to fuck them out of their shares? I may be vindictive but I would not walk away, and would rather see the whole venture tank than get blackmailed into giving away a year of my work for free. To be clear, I wouldn't do anything illegal that would be dumb. But I wouldn't roll over just because a bully tried to bully me out of my cut.