Bobby stares in horror at what he sees in the hallway. It looks like an abattoir. The wall are soaked with blood spray. The floor is covered in slowly congealing blood. Dean's body is partially covering Sam's body. Dean is covered in Sam's blood. Sam is covered in Dean's blood.
"What did you idjits do?" He sees the bloody axe lying close to the brothers. He sees Dean's Colt .45 lying in the slop of brains and blood close by Dean's side. The back of Dean's head is missing.
"No Dean, No" his voice quavers and breaks. "You stupid sonsabitches".
Bobby had loved these boys like his own flesh and blood for years. They were the sons he'd never been able to have. He'd seen them as young children, then years later as young men. He'd been impressed at how well they'd turned out even after the way their father had raised them. Now the whole Winchester family was gone. Bobby swore he would find that siren and kill it if it was the last thing he ever did in his life.