BUT
Imagine if Dean thinks it’s a fake call, that the Angels are mimicking Cas to get to him and Jack so he hangs up on him.
Like Bobby with Dean’s resurrection in 4×01.
Ironyyyyyyyyy!!!!! (Cos Cas is the one who resurrected him of course)
CUE ANGER AND UPSET AND DESPAIR AND A NICE BRO-MENT OF SUPPORT FROM SAM UNTIL THE POINT WHERE HE ACTUALLY TURNS UP AND ?????????????????