Merlin walked down to the dungeons. After a lot of thinking, he had decided to ask Morgana what she thought should be done about her. He didn't have much hopes that he'd get an answer beyond hoping he and Arthur would die, but he felt that she deserved the choice.
When he got to her cell, he found that Morgana was sleeping. "Morgana!" he hissed, but she didn't wake up.
Morgana, he called out mentally, and Morgana stirred on the bed, slowly coming awake.
"What do you want?" she asked.
"I want to ask you a question," replied Merlin. "You have a choice between being executed, or living a life without magic. What do you pick?"
Morgana felt a spike of fear at Merlin's cold tone. She looked at his face to see if he was being serious, but there was no emotion there.
"Let me think," she said.
"You have until we get back from rescuing King Rodor to think about it," said Merlin. "Goodnight."
"Wait!" Morgana called, and Merlin turned around. "What happens if I don't have an answer for you?"
"I think I'll let Arthur decide," said Merlin. "And honestly, I have no clue what he'd pick, so if I were you, I'd have an answer by the time we're back." With that, he walked off, leaving Morgana alone and terrified in her cell.
Merlin woke up early the next morning, and quickly went to Arthur's chambers. When he was serving dinner last night, Arthur had told him that Mithian was starting to worry about her father, so Arthur wanted to go as soon as possible to help rescue King Rodor.
Merlin wasn't sure what to do about Morgana. It was already getting hard to maintain the lock on Morgana's magic, and he wasn't sure if he'd be able to keep her magic suppressed at a distance. On the other hand, he couldn't leave Arthur to babysit Morgana, if Arthur would even allow him to do that.
Merlin knew that bringing Morgana with them would probably be the best solution, but he had no idea if Arthur would allow that to happen either. However, he reasoned that there was no harm in trying to ask Arthur if he could do that.
When he reached Arthur's chambers, bearing breakfast, he knocked, and came in at Arthur's command. Once he had served breakfast, he stood around, watching Arthur and Gwen eat.
Finally, Arthur noticed that Merlin was staring at him, and said, "Is something the problem, Merlin?"
"Yes," replied Merlin. "I think the only way to keep control over Morgana is to bring her with us on the rescue mission."
Arthur opened his mouth- probably to insult Merlin's intelligence- but Gwen spoke first, saying, "And why is that?"
"I don't know if I can control her magic if I'm far away from her, and I can't abandon you. So I take her with us, keep her magic under control, and probably keep her unconscious basically the whole time."
"That actually could work," said Arthur slowly. "I think we can try that then. Just remember, Merlin- if it messes up, it's on your head."
"Yes, Sire," said Merlin, smiling happily.