The glorious feeling you get when you spot a plot detail that needs to be changed in order to prevent all your protagonists from dying a gruesome death before the first book is over. Yay, plotting! :D
Aaand now I have to deal with immunity problems. Yay, plotting T_T
At least I noticed before I reached the chapter in question. Going back and adding stuff is like cutting your trousers off at the knee and adding two inches of sliiightly different cloth because they were too short. You can get away with it, but it will be noticeable, and it will always feel kinda-sorta wrong. Also, whoever thinks that’s a legit way of altering trousers: Please hand them over to a professional. Or at least a friend who can sew (not to be confused with ‘a friend you can sue’. Which is literally what I typed here first. Why, brain?). You’ll be very grateful later.