Okay I hate having to explain the joke because it points out how weak the premise really is but this pun is kind of specific... In our Martial Art school instead of calling it a belt test or testing for a new rank we call them Rank Promotions... hence Jace's disappointment. He didn't think it would be an Promotion in the Advertising sense so much as the rank testing sense. Heh... get it?!
Remember to check in Friday for a full 4 panel gag comic which Kicks off (pun intended) our next story arc.