The "bridging gaps" part. I tend to plan out my story based on story beats I want to happen, so I'll have a list of things that need to happen by the end of the chapter or storyarc... and also things I want to set up, establish or foreshadow for much later.... and unfortunately all the things I've planned later that came out organically, which didn't feel like a huge list at the time, is suddenly a lot of stuff to juggle.
So then I'm in this situation where I need to manage spinning plates. I know all the things that I need to bring up and have happen.... but also I can't just have the characters stand around and talk it all out; there need to be action scenes, jokes, set pieces.... aaaaaagh.
It's been really hard this chapter, because I knew Rekki needed to go to Camelot to talk to Urien, both to maintain Urien in the audience's mind as a threat and to give Rekki motivation, and I also knew Rekki needed to meet up with Subo so she could explain her backstory with Sarin before she inevitably runs into her. Then on top of that, the audience needed to be reintroduced to Sarin as an adult, and to see her getting the wrong idea about Jules.... Plus I needed to establish that Jules is part of a plot to overthrow Urien.... and then, oh crap, did I forget to fit Rocket into this story aaaaagh.... better fit Rocket in there somewhere.... and the concept of demonic possession... and changelings... this is fine...this is fine....heeeeelp!