This was a challenging episode. It surely made you think in several directions.
I realize most people hate Celine's singing but I think it's a great song. Her voice has range, that's for sure.
One thing I have found disturbing throughout the series is when an angel dies that's it. In other words, there "ain't no more." Obviously, I was raised to hope that heaven is the end of the road where death no longer exists. Seems to me a couple of seasons ago Cas discussed what happens to angels when they are stabbed with that special knife, but I can't remember how he explained it. Anybody?
I think Cas is nearing his breaking point. The stress of having to kill Rachel is going to take it's toll.