No, the core idea is that you want the incentives to be right even in bad situations. So if your enemy has medics who he lets tend the wounded, even if they're

No, the core idea is that you want the incentives to be right even in bad situations. So if your enemy has medics who he lets tend the wounded, even if they're your wounded, then you stay away from them. You want surrender and truces to be respected, so you don't make use of false surrender or truces as ruses. But even though you respect such things, your enemy is still your enemy. Similarly, in this case Sally is still a criminal, but you want her to report crimes if she happens to be willing to do so for some reasons, so you don't exploit people's reports of crimes in order to go after those people themselves, unless the report itself is malicious or deceptive and is therefore not a report at all.