The lighting in that pic makes it difficult to see how much twist there is. But, to get the worst out, if you steam the whole stave for an hour and a half, you can pull it out and then QUICKLY clamp one end in a vise and then throw a big pipe wrench on the other. Torque it like heck to straighten 'best you can, and use some rope to tie the pipe wrench off under stress. You can do the same thing, too ,with dry heat, by working the limbs in sections and adding more torque as you go. If it really has 90 degrees of twist, you're not going to get it all out, but you can probably get it to where it's manageable.