I don’t think the guard ordered the original dark one around. The guard seemed scared of the dark one. The episode seemed to suggest that the duke, who we never actually saw in the episode, could order the dark one around, the guy who had the knife, but we never actually saw that happen. It might be complicated though. Like you would have to be very specific in your orders.
I just think we need more information because the original dark one just wanted to die so what he said is not the complete truth i think. I don’t know if anyone has seen the tenth kingdom, but it was like the wishes in that show. The dad wished for a million dollars so he got a million dollars, but it was stolen so then the cops were chasing him. It would be sort of like that with giving the orders to the dark one. Also the wishes were like that in this show where they ended badly every time.