Jacob had been making the offer, with the intention of paying for them. But as Wrathion suggests he pays, and Wrathion has a patron, then Jacob will allow the act of charity.

"Alright, but next time it's on me. They've got interesting grub here. A lot different to the food at home. I've yet to even see a bowl of gruel."

He's a joke as he relaxes and falls into step with Wrathion, happy to allow the ruby-eyed man to lead the way.