Seems like readers aren't fond of the newest chapter (18: Crossing the Line). Either that, or a new reader REALLY didn't like the story premise.
Spoiler Alert: The chapter deals with Phil losing it and going on the warpath, taking everyone by surprise, so I can see people having a negative reaction to it, but it leads directly into the next section (VI: Dragons of One's Own).
Feel free to lambast me for it, but please, specify the reasons so I can either respond or take your opinion into consideration for future updates. :)