INT 24 isn't enough to predict a sequence of events like that.  It is enough to list out lots of possibilities and optimize over the probable ones.

That person did explicitly consider that Carissa, having obtained an artifact headband, had been cognitively perturbed, and might defect from Cheliax once out of her previous cognitive situation.  Serving Asmodeus is kind of stupid.

That person did moreover explicitly consider that Carissa might be more ripe for defection from Cheliax if she was put into a situation where her mind was knowably-to-her probably not being read, such as a situation which prompted high-powered Nondetection, or Mind Blank.

This situation - as is, in fact, not exactly what has occurred - was his major possibility #5, subpossibility #5.3.  Probability 3%.

INT 24 isn't enough to predict a sequence of events like that.  It is enough to list out lots of possibilities and optimize over the probable ones.

That person did explicitly consider that Carissa, having obtained an artifact headband, had been cognitively perturbed, and might defect from Cheliax once out of her previous cognitive situation.

That person did moreover explicitly consider that Carissa might be more ripe for defection from Cheliax if she was put into a situation where her mind was knowably-to-her probably not being read, such as a situation which prompted high-powered Nondetection, or Mind Blank.

This situation - as is, in fact, not exactly what has occurred - was his major possibility #5, subpossibility #5.3.  Probability 3%.

INT 24 isn't enough to predict a sequence of events like that.  It is enough to list out lots of possibilities and optimize over the probable ones.

That person did explicitly consider that Carissa, having obtained an artifact headband, had been cognitively perturbed, and might defect from Cheliax once out of her previous state of mind.

That person did moreover explicitly consider that Carissa might be more ripe for defection from Cheliax if she was put into a situation where her mind was knowably-to-her probably not being read, such as a situation which prompted high-powered Nondetection, or Mind Blank.

This situation - as is, in fact, not exactly what has occurred - was his major possibility #5, subpossibility #5.3.  Probability 3%.