Anthrabert is the dude who wants you to torch Mpenzak's cart. The only problem with turning him down and then reporting him is that a later quest gets slightly screwed up. Anthrabert apparently gets towed off to jail leaving all belongings in his room at the Ducal Inn. You can retrieve an Exquisite Bottle of Wine from there and use it to complete the Corinna Summoning Quest but then a "Get Bottle of Exquisite Wine" entry remains permanently unsolved in your quest list.
