Volume 19 follows the group as they prepare to attack Negan. Lots of action and things happening in this volume. I think that Rick greatly underestimated Negan.
Negan is a psycho, but he's definitely not stupid. This volume was intense, especially the confrontation with Negan. I think Negan is very unpredictable. I think Rick and his group were lucky that Negan decided to do a lot of talking before actually taking any action.
I can't wait to read the next volume.