[Jaden]

Spoiler:

I'm pretty baffled at the situation now...Rem is going to kill L, but Rem can't kill L. That would be a stupid ending to Death Note.
So, there'll have to be some dramatic turn of events early in the next episode where Rem dies! It's the only option. L can't be immune to the death note, even if he has no name there can't be such a fatal flaw in the death gods that they can't kill nameless people. And if L was unkillable Ryuk would probably have noticed it and we would have seen some kind of reaction from him. The one to die in the next episode will be Rem not L, just wait and see!