Well in regards to exposition, I want to be a writer and looking for chances to practice the craft. Anyways, someone from blood ties did a internal monologue on how the dog attacked them so I can't see how it can be a problem (I also liked it). Lastly, its not much of an information dump when its one paragraph describing the current physical condition that Eric is in. I believe its important and lets the reader know the limitations of the characters involved, how and why they act the way they do.
Raven said the fiends were smart so the last thing they do would is keep a bunch of prisoners together. Worse, with potential leaders and those with combat experience in the same room. If this were a cell block type situation then its possible. Folks can talk to eachother if their cells were next to echother but that also goes so far. Also, all tied up is a thread meant for info buildup/drama. You eliminate prison escape plans, drama, info, then all you got is a couple of guys making idle banter for 24 hour period which doesn't seem to work.