Honestly he thinks Aroden was being kind of careless, though he was also being - nice? He grabbed Carissa when she was out trying to recruit voluntary wizard hosts for them, and he interrogated her in his personal demiplane and stole her hair (to clarify, she has an osmium-lined wig because after extensive experimentation they discovered this blocked Detect Thoughts, though it seems not to reliably block Thoughtsensing.)
But then after that he brought her back to his office in Rahadoum and Iomedae personally sent one of her clerics or paladins or something to offer Carissa an Atonement - and, being a servant of Iomedae, the woman instead had a very kind conversation with Carissa and then let her go to the bathroom unsupervised, where she managed to cast Gaseous Form and slither out through the wall.
- oh and then much of how she actually got away is because Aroden then spotted Mhalir's shuttle and focused on capturing him. But she did get away, and used scrolls to teleport herself to Vigil, out of Aroden's reach.