Disclaimer: I do not own Supernatural.
Castiel watched until he grew tired of watching. From above, he slowly watched the process of the righteous man turn into a savage monster.
It was sickening to observe what was happening down there, but until he received further orders, he could not act of his own volition.
His brothers and sisters whispered words of comfort to him. And caution.
"Give it time."
"It has not yet come to pass, brother."
So, drifting in the cool blue of the clouds, Castiel waited in solitude.
Waiting to be called to save the righteous man from his evil master.