[Dean's eyes are wide and horrified at the sight of his angel killing himself to save these people, and tears prick at the corners of his eyes. Everything is getting worse and worse and Dean hates every bit of it.]
God dammit, Cas! No! You know what, screw you! You told me to try to hold on when I was dyin' and now you do this?!
[His expression cracks and Dean tries so damn hard not to let any of the tears escape. The feed shakes and he covers his eyes for a moment, his voice quieter.] Stupid, stupid son of a bitch. I needed you.
[He rakes his hand down his face, wiping off the one tear that escaped, and taking a rough breath in.] I'm comin' to pick you up and I swear to God, if you're dead, I'm gonna kill you myself when you get back. [But for now, he'll keep Castiel in his room, considering the house will be full up of dead bodies at this rate.]