The wind, the trees and the sun.
His gaze landed on the blood red skies, soon. Soon he will be coming for her. Although he has drifted of course from the plan slightly. But he could no longer remain in the Imperial castle under a neutral stance.
After they framed Lyn for attempting to murder Andrew. They debated what to do with him, as her 'fiance' naturally he would not come unscathed. However at the time of the so called attempt, he was in the middle of a meeting with the Mist Kingdom elders.
So unfortunately all Lethia could do was put him under house arrest. He stayed put, waiting for the right time to strike. However, the third Princess sent him a letter saying that she would start the rebellion.
'I am unfit to lead the army, but if it's you Prince. I am sure people will listen.'
This may deviate slightly from the plan but as long as he can rescue Prince Andrew, it ought to still work.