In The Problem of Thor Bridge, Holmes begins running through the background of his latest case before telling Watson that he has a client:
"The fact is that the problem, though exceedingly sensational, appeared to present no difficulty. The interesting personality of the accused does not obscure the clearness of the evidence. That was the view taken by the coroner's jury and also in the police-court proceedings. It is now referred to the Assizes at Winchester. I fear it is a thankless business. I can discover facts, Watson, but I cannot change them. Unless some entirely new and unexpected ones come to light I do not see what my client can hope for."
"Ah, I forgot I had not told you. I am getting into your involved habit, Watson, of telling a story backward. You had best read this first."
While Holmes often takes small jabs at the liberties Watson takes in chronicling his cases for the public, I don't totally understand this comment.
In what way did Holmes consider Watson to be telling some (or all?) of his stories "backward"?