[Vanya]

I agree with few last posts; we mustn't mix movie and book. And, war would be inevitable if Elrond attacked Isildur. I think they were very close friends and alies, (and relatives) and even if Elrond did realised at that moment the consequences of Isildur's act, it is normal that he still hasitated. And I think that nobody really knew the nature of the Ring, in details that we know.