"Can we just-" Robin held a hand up for them all to stop for a second. "We are not making this decision now. And we are not," he said quietly but firmly, "going to do anything that means that shit is anywhere near you, Mar." That dungeon meant they were responsible for the sheriff for the rest of forever. He would haunt Marian's days for the rest of eternity and Robin couldn't have it.
"We're goin to take some time. We have time. Michael can do...angelic walls? Summat means the sheriff can't leave Michael's house. He's contained and stuck with someone he's terrified of. Which is great. We'll get some breathing space and come together as a family to decide. Not now. Not as a knee-jerk reaction."