Sword Art Online S02 E06 Showdown in the Wilderness

"Blurring the line between the virtual and the real."

A man in a beat-up cloak watches Kirito fight his first battle and demands to know if he's "the real thing". The man has the tattoo of Laughing Coffin, a murderer's guild that existed within SAO. He tells Kirito that he'll kill him someday, and vanishes.