I had already read the books so I knew already

No. I knew because the books are 100 years old and everyone knows he came back and why. I think.

If you mean in SHERLOCK, we see him watching Watson at the grave, but before that, I assumed it was a trick because he is not going to lose at his own game (smarts) and how would they have done another series if they killed him. He can end up with a tie or as the winner, with Morority, but never lose. That's the relationship.

If he can be bested what's the point? B)

I've read the books before, so I knew the fellow won't die.