"What I need to say? Cas, you almost brought the end of the world on our heads for the second time--maybe you did! With these damn Leviathan things, I don't know. There is so much I want to say it'd take weeks to get it all out!"

Lots of it is very angry. An equally significant portion of it is just kind of wounded and betrayed. Still.

Well, maybe he'll just start with the most important thing.

"Where have you been? Cas, if you were back, why didn't you come find me?"