Originally Posted by thestartrekker
I think everyone was shocked because he left with no warning or explanation, and the fear was that he had defected.
That doesn't preclude the possibility of Spock being sent on an official ambassadorial mission to Romulus before Kirk dies on the Enterprise-B in Generations.
I think the point NCC was making is that Kirk couldn't have known about Spock traveling to Romulus prior to his own "death" on the 1701-B. If that was the case then the news of Spock on Romulas in "unification" would have been rather old.