Read it through once

“He gazed at me with bleared, drunken eyes for a moment, and then I saw a horror spring up in them, and convulse his whole features, which showed me that he knew me. He staggered back with a livid face, and I saw the perspiration break out upon his brow, while his teeth chattered in his head. At the sight, I leaned my back against the door and laughed loud and long. I had always known that vengeance would be sweet, but I had never hoped for the contentment of soul which now possessed me.