King Lamoni is astonished to know that Ammon is preparing the horses and chariots. It would be an understandable expectation that one who had accomplished some great feat might want recognition for it, might at least want to bask in victory for a while, rather than simply return to work. Ammon asked for no glory. He simply went to work on what was likely a reasonably menial task.
In verse 11, Lamoni desires that Ammon come to him, but “durst not.” As we learned in verse 5, King Lamoni was afraid that Ammon really was the Great Spirit come in anger over Lamoni’s actions. On the one hand, King Lamoni wants to know more of the powerful man, or “more than a man” in their midst. On the other hand, Lamoni likely fears that Ammon has come to do to him what Lamoni had done to previous servants at the waters of Sebus.