I'll be putting up an interrogation log for Cassandra, if you want to RP the interrogation itself and see how Guy reacts. It may not be as bad as he fears, especially if he's willing to sign on with the Inquisition officially/promise not to mess around with rifts, or if she determines that he's not really able to do anything to put people in harm's way. Remember that it's the rifter mages that she views as a real threat.

If he does leave, just remember that there will be factors in place to prevent rifters from leaving (guards, mainly) - if you want Guy to successfully get out, you'll have to work out how that happens, whether it's Galadriel helping him escape notice or something else. Also make sure to talk to the mods about the anchor leash if he does get away.