Before I forget, I can answer one of your questions. :).
The promise, Rood is referring to, is from when Meredith offered a deal for Rood to come with him to the Tower, and everyone will be safely free from the Tower. (And that was on the condition that Rood disables his Awakening.) Then, once Rood was in the Tower, he was hoping the deal was made that everyone was out of the Tower. Well, considering he can now use x-ray vision, it looks like Meredith broke the promise by keeping the students in the Tower.