OK GUYS. New scenario.

We start with a Sam montage - he’s calling up every hunter he knows about how to get into Purgatory. No dice. He calls up demons. Monsters. Gods. Nada.

Finally, desperate, he busts into a room full of demons yelling for Crowley. Crowley dutifully appears, wittily berates Sam for wasting time on his brother and a traitor angel. Crowley tells his boys to teach Sam a lesson - just leave him breathing. And don’t touch his pretty face.

Crowley winks out and Sam is set up by a nest of demons. He’s impossibly out-numbered, backed up against a wall, but he pulls out a knife (possibly THE knife, if it’s not with Dean) and stares grimly at his opponents.

THEN - 

Bang-flash!

There’s a tear in the air in front of him and DEAN stumbles through. JUST making it before the mysterious doorway seals shut behind him.

On his knees, Dean blinks up, disorientated. “Did we make it?” he mutters, to no one in particular.

Sam drops down and grabs his brother by the shoulders. “Dean! Are you -?” He assesses Dean for a moment. Suspicious. “How -?”

Then the nearest demon laughs unpleasantly. “Hey look. Two for the price of one.”

Deciding to authenticate his brother’s identity later, Sam drags Dean to his feet. “We gotta get out of here. Can -?”

But Dean’s been blinking at the demons as Sam talks, finally aware of the situation. He pushes Sam roughly behind him, cutting him off. “Stay behind me.”

Dean lifts an arm and gestures sharply to the side. Three or four of the nearest demons fly into the air and are catapulted backwards into the others massing behind, starting a domino effect so near to half of the group are fallen or stumbling. Then, before Sam can say a word, Dean is rushing into the fray. 

With a flick of his wrist an angel blade appears in Dean’s hand and he starts slashing. Demons drop like flies. Those Dean doesn’t get a chance to stab he presses a palm to the foreheads of instead and their eyes glow bright white as they die inside their vessels. Soon enough all the demons are disposed of and Dean stands in the midst of a pile of dead or unconscious bodies, angel blade held at his side, the tip dripping red.

“Dean?” Sam asks. Breathless. Uncertain.

Dean looks up, body held perfectly still, gaze unwavering.

“Hello, Sam.”

Silence as Sam stares back, understanding slowly dawning in his eyes.

“…Cas?“