Merlin and Brynn were caught between a rock and a hard place. Either they use magic and give their secret away, or try to fight Morgana and Agravaine. Brynn had already been claimed to be a witch by Morgana. Without her powers, Morgana could still beat them, for she was an excellent swordswoman. Brynn charged at Morgana with her sword, and then muttered a spell only the two could hear. Morgana tripped. Brynn wanted it to look like the witch had just been clumsy.
"Too scared to let your friends know the truth?" mocked Morgana.
"Why would they believe you Morgana? All you have done the last two years is lie!" remarked Merlin in defense of his friend.
Morgana just smiled.
"I already know you are a coward Merlin but she sought me out and she won't even tell them the truth!" said Morgana.
"I have your back!" whispered Brynn to Merlin.
After all he knew more about Morgana and the tactic of distracting her was their best shot.
"Did I ever tell anyone of your powers? No! I told you about the druids! You are letting your bitterness make you this way! And your friend Morgause just twisted things farther!"
Morgana screeched with rage. As Merlin drew forward to attack with his sword, and Morgana to utter a spell, Brynn counterattacked the spell with her own defense magic.
"Pity, Merlin, that you're letting a girl fight for you!" said Morgana.
"I never had a problem with that, you once would have done that for me!"
Then Merlin saw the necklace Brynn had slipped on Morgana and knew what he had to do. Despite her evil, he didn't want to kill her. He glanced wordlessly at Brynn and moved his eyes to the necklace. He hoped that despite fighting with Morgana Brynn would notice. She did and nodded, then had to distract Morgana and the others from catching Merlin using magic. Brynn let Morgana knock them backwards and as she went to glower, didn't spot Merlin was ok. He used the spell Brynn had to activate the magic by use of the tokens.
Memories flooded Morgana again. This time it was Merlin's memories. Through Merlin's eyes, (unknowingly) Morgana saw the pain of Morgana's betrayal or in the past when she was in danger. She also saw Merlin's reasoning for poisoning her, that he wished he didn't have to do so and many other things. Morgana was starting to feel this wasn't a trick, and it all felt real, and heartbreaking. Her real heart might just be waking up. When the others were recovering, she was having an internal battle and cast the blasting spell again, then fled.