I know that this episode was humorous and now I'm infusing it with angst. I'd apologize, but I'm not sorry.
Morgana had plans for Merlin. Wonderfully simple, poetic plans. Really, Merlin's devotion to Arthur was unparalleled. If Morgana didn't know any better, she'd have said that the idiot was in love with her darling brother. What better way to kill Arthur then to have his most loyal servant, his trusted friend deliver the death blow?
But first. Information.
Agravaine was her eyes and ears in Camelot, yes, but Arthur didn't make his uncle privy to everything. Arthur had long taken Merlin's council, and there was nothing about the young king that Merlin didn't know. So before Morgana sent him on his merry way to murder his master, she needed to see what Merlin knew.
Unfortunately, Merlin was strong. Morgana had always known Merlin was braver than others gave him credit for, but his resistance to her methods was… annoying, to say the least. He spent the first five hours refusing to say anything, and even when he did begin talking it was all nonsense.
"To have and to hold…" he whispered, his lips chapped. The words were breathed out more than actually spoken, so quiet that Morgana could barely understand them.
"What is that supposed to mean?" Agravaine asked, bored and a little spooked by Morgana's torture methods. Squeamish idiot. She couldn't wait to get rid of him.
"…for better or for worse…"
Morgana seized Merlin's chin and jerked his face up to meet hers. "You'll tell me what I want," she informed him. "I suggest you make it sooner rather than later."
Merlin's eyes were dull and he seemed to stare right through her. "…for richer, for poorer, in sickness and in health…"
Morgana released him and stalked over to her ingredient shelves. They were wasting their time. If Merlin was gone for too long Arthur would begin to worry. Honestly, it was like Merlin was Arthur's personal pet instead of a servant.
"…to love and to cherish…"
Morgana grabbed the jar she'd threatened Merlin with earlier. Time to make good on that threat.
"…from this day forward…"
Morgana cut off the appropriate head and stalked back over to Merlin.
"…until death do us part," Merlin finished, the breath wheezing out of him.
Morgana inserted the Fomorroh head into the back of Merlin's neck.