When Ivan and Samantha were set to leave, Herbert showed up with Ivan's black steed.
Ivan helped Samantha mount his steed before taking his place behind her, and Herbert had insisted he come along with them, as he could not leave the two people whom he was protective of to themselves. Moreso, his Majesty had decided to conceal his vampire essence by appearing human to the elves.
He knew his presence was not necessary, but to secure their safety, he was obliged to stay by their side and be their third eye.
"Alright, you can come." Ivan eventually agreed after Herbert's persistence, and the relieved guard quickly fetched his horse.
Together, the three of them left the tent.