Castiel knelt down so he could look Ben directly in the eyes, so there could be no mistakes, no misunderstandings.
"I can't claim to know what's going on here, but I promise you, I promise that I am not going to stop until I get your Dad back. And the rest of them as well. You are not going to lose your family. Whatever it takes, I will get them back, remembering who they really are."
No matter what. That was the promise Castiel was inwardly swearing, to himself, to his Father. Inside he was fuming that someone else had dared strike against the Winchesters this way, and he wasn't going to stop until it was put right.