When danger isn’t: in some cases, Defy Danger will trigger for some classes and not for others. Some characters, not for others. Let’s talk about examples. I’ll start.
When the Fighter and the Wizard are presented with the mind-altering Orb of Zarkan, stolen from the Wizard’s school, the Fighter has to Defy the Danger of being ensorceled. The Wizard, who has previously described themselves having undergone the rites to gaze on the Orb and stay sane, does not.
What else? How else does fictionally positioning yourself help avoid defiance of danger?