I hope it's clear just in context that it's Jay saying "nope", but just in case there would've been fist fights arguing over it, word of Dan is "it was Jay".
I would say "if you've played The Elder Scrolls IV: Oblivion, that first line will sound familiar", but I never actually heard "stop right there, criminal scum!" while playing that game.
Because I was a GOOD Hero of Kvatch.
...And never got around to the Thieves Guild.
I HAD heard it many times on the YouTubes, however, hence how I wound up referencing it here.