Dean watches as the man before him practices parts of certain rituals and incantations. It is one of his most favorite things in this world, Sam's voice. Sam has a beautiful voice, no matter what he is saying. He can even make an aggravated curse in Dean's direction sound like a song.
Times like these, though, are when Sam's voice is the most wondrous. He rolls the old language off his tongue like he is savoring a rare delicacy. With those rosy lips that seem so innocent, Sam can shape words to kill. He can weave traps that will hold both Heaven and Hell.
It scares Dean sometimes. If Sam can harness the words to destroy God and Lucifer, to hold the world to his will, how can Dean ever be expected to escape?
But then Sam looks up and smiles, pleased that he has finally mastered yet another incantation and Dean knows he wouldn't try to escape even if he knew how. He is content to stay and listen to the cadence of the old language as it spills out of Sam's lips and he uses it to spin traps and spells that can end the world.