"You're welcome, Yukine. Take care." Hakkai returns the bow, smiling, and adds, "I won't keep you any longer! Go, catch up."

He hopes Yukine will call if he needs anything. While Yato might have better connections with the older gods, and know which of them are reliable in a pinch, Hakkai can't help distrusting most of them himself. It's not so much what they've done, but --

-- Well, he still doesn't have the grasp of their motivations that he would prefer to.

He certainly doesn't want to leave Yukine's safety up to them, he thinks, but keeps smiling as the young shinki leaves.