Mara, often short for Mara-Papiyas, is the lord of the sixth heaven of the Desire Realm and the head of gods in Mount Meru. It is said that if a man could reach beyond the sixth heaven, he will then overcome all kinds of desires and delusions to go on the path to enlightenment. So there is only a line between the Buddha and the devil!
He may have only come within earshot after gerwer let go of Deon? Otherwise it was just him trying to show that he's above the dukes and feel like a big powerful man lol