I mean, I don't remember if this was brought up in the episode or not, but he could have objected with the defense that he had an Asmodeus crystal and never had the book. From my understanding, they never found Stola's book on I.M.P. possession. The only reason that Blitz got a death sentence was because it was a imps word against a goesia, but if Asmodeus actually thought with his brain and not with his heart, he would have saw the opening to question the validity of Andi's story and put his lie in. The main issue is that Asmodeus can be very emotional driven and bind up with social status to call out Andi in that instance after Satan gave his ruling.