The demon was getting more distracted as Callisa smiled and sang her mother's composition. Then, that's when Ramiel and Gray ran to catch that demon while Eris was trying to foresee the demon's name. They need it to banish this demon.
Callisa watched everything that happened before her. She didn't expect that the demon would get that form of sword and strike it directly to Ramiel's chest. Terrence covered her eyes as the headphones fell. It took a few seconds before Callisa could get it into her head. She screamed, which made Terrence wince. He puts Callisa down as her scream echoes that interrupting the demon from killing Ramiel.
Ramiel raised his sword and tossed the silver vase toward Marvin as Eris focused on whispering in the air as the demon screamed and swirled toward the vase. That's when Ramiel got up and sliced his wrist over the vase and Terrence brought Callisa as she stood and took out her gem together with Eris.