There was a big difference between their first and second attempts. While part of it could have been attributed to the severity of the wounds they'd tried to heal, Merlin was also convinced that the mistake from before had simply been due to the change in power. A little adjustment from Cas, and he was in fine shape, from the looks of it.

"You gave me a little something, too, didn't you?" Merlin tilted his head in Nakama's direction. "It felt different."