I've taken Miles willingness to help Charlie as him looking for redemption for all of the stuff he did as General of the militia. We didn't learn everything thing about The Blackout yet, but I thought they set up some pretty interesting stuff in last night's ep. I'm definitely getting the impression Randal was part of something bigger, who will probably end up being the show's big bad once Monroe has been dealt with.
As for the episode itself, I really enjoyed it. I enjoyed getting more world building for the Monroe militia, and it was nice getting to spend a little more time with Rachel. I'm curious where things will go now that Miles & Charlie know about the pendant and what it can do. I'm also wondering if there are any Monroe survivors from the boat or lighthouse that can report back about the power coming on.