Yeah because of course his Press Secretary wasn't in the back of the room telling him not to say the word. Of course the Secret Service wasn't busy re securing the building before the President moved, and most likely would have done anything to keep him in that room where he remained secure. Of course there hadn't been a unauthorized camera crew trying to gain access to Bush earlier in the day, thus spooking the Secret Service even more.
And seriously, Carter = Worst President and Ex President in Modern American History. The utter horrors the man put this nation through in 4 years its just insane.