It's one reason he plays king sitting on his throne. So few people will approach him like that. It allows him to over see what's going on without the pressure of playing genial host. However, when Jack approaches, it's not an intrusion. He's in the mood to be social.
He smirks and tilts his head to the side in a sort of shrug. "I've been working on my own sort of beard, It just hasn't achieved the necessary imagery yet." He rubs a hand across his stubble.