In the end, Ryan decided to accept the risk. He didn't feel the need until now of learning Perfect Replication, probably due to its cost, but now it was absolutely necessary.
When Ryan obtained the class, he felt Ymir's eyes moving toward him. Until now, he looked toward the battles without showing any motivation. He even still was with his arms crossed, but his neutral expression broke a little when he saw Ryan and his status.
"You… who are you?" Ymir asked.
Ryan thought Ymir was looking at him, but he was looking toward Merlin, even though he was in his stealth mode, where no one could see him.
"How do you do, my name is Merlin," Merlin said.
"I can feel a different aura in you… is very similar to the aura that Lucifer has," Ymir said.
Ryan and everyone else frowned when they heard that. Why would Merlin's presence be like Lucifer? And why did the Angels never mention that?