I really wanted the reader to know the special relationship these two had abs felt this was a perfect chapter to do it in. I mean 10 pages of just walling in the snow would have been pretty hard to fill all that show there was nothing like a flash back memory for the reader to understand why these two are unique, yes they where also in the same training class that the reader learned in the beginning but this really shows the connection these two have. With every book you typically have a boring chapter or two just to progress the story line but I figured there was a way to progress the story line tell the back story and keep it exciting