"Probably would have made you feel better if I did." Shove him in here and closed the door on him. Then Raylan would have another thing to be mad about and Doc wouldn't just be an almost-but-never-quite-innocent bystander having to keep a wary eye on Raylan.

"I really-- would not want to come with you. But if it's important to you, tell me so." He would get up, pat the dirt off his pants and try to pull himself together enough to go back down there.

It isn't going to get any brighter down here. Even if they did find all the hatches and opened up all the trapdoors to try and let some light in. Their torches barely work here and they're as bright as they can come. Even if they don't go exploring today, there is no telling that they would feel any better coming down here on a different day.