Basically a Merlin + Assassin combo. Sweet! That's awesome. I suspect this will make things actually harder for the investigators.
Yeah, when Madame Professor was explaining what the witness does, she was like, "the Witness knows which two players (but not which is which) the Murderer and Accomplice are, but not the murder weapon or the evidence" I was like "Well, that's dumb. I hate the witness."
Then she said "but if the Investigators solve the crime, the Murderer and Accomplice get to guess who the Witness is. If they're right, the witness is killed and they win," I said "Oh, like Avalon? I changed my mind, that's awesome."