Sam had hoped that his dad would be a bit more calm when he heard the news he said, but as he predicted as the more plausible reaction, John sreeched the impala to a halt and got out the car, screaming his head off. Sam was initially too terrified to leave the car, especially as he saw Dean trying to diffuse the situation and save him from being hit. Yet the moment JOhn went on the attack verbally to Dean, he couldn't take it anymore. He grabbed his bag and got out the car, keeping his distance from his dad and decided now was the time to speak back. "Enough!! Don't hit him! Or me! This isn't normal dad! THis job? THis life? it's YOUR life! Maybe even Dean's! But this has NEVER been my life! I've never wanted this life! I'm going dad whether you like it or not! And Dean hasn't been poisoned by Kenzi!" he screamed at him, showing him all the pain and anger he had pent up in his words. 

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Mika was elsewhere, nowhere near the Winchesters for once in her life. The last year and a half had been difficult. John found out what she was still meeting up with Dean either in their motels or on cases to help each other out when they really needed backup. She couldn't forget the night John found them in the motel as Dean was patching her up after she had patched him up and John absolutely lost his shit over it and quite literally threw her out of the room to have a go at Dean after screaming at her for being around his son. That night she found herself getting to the nearest dive bar and drinking until she felt she could pass out and sleep in her car. Ever since then, it was even more of a risk whenever she met up with Dean. 

Here and now she was on a hunt, a simple one really involving a vengeful ghost that just refused to move on and pass over, instead enjoying terrorising poor bastards on the side of the road, luring them into the woods to kill them.