Sora & Cas
Sora nodded when Dean assured again we'd get this finished now and both him and Mika be sent back home, when the spirit of Mika's father had come back. It was then he saw Mika slowly walk up towards it by the salt line and he tried to stop her, "Mika, no" he said as he tried to reach out to her, but Cas intervened, grabbing Sora's shoulder and teleporting them downstairs.
"Cas! What did you do that for?" Sora asked Cas trying to get back past him. "I'm sorry Mike, but it's clear your feelings for Mika are strong, and you are one of the many reasons she's able to keep strong, but she needs to do this by herself, you understand? She can't have anyone intefering." Cas replied keeping Sora held back.
"But..." Sora went to carry on talking, "No buts, this is the only way without any lives being lost, ok? Besides, you're needed down here anyway, the other spirit will be back in a moment and it'll be up to you to get rid of it for good" Cas replied after interupting Sora.
"But how? We don't know who or what this is yet. And why me?" Sora asked, still trying at times to get past, "You have a strong good side inside you Mike, someone is watching over you, they will be your key." Cas said patting Sora's shoulder, Sora sighed "Great, riddles?...now?" thinking to himself.