It’s one of the few examples of a, well, I guess it’s still technically nearly a plot hole, not a true formal plot hole. You’ve got this person who cannot be hurt by radiation who helps you by going into an irradiated area to get something to save people. Then when THE SAME THING happens again, they just say “nah, this is your story, you’re meant to die here, I’m literally going to let you kill yourself to save everyone even though I just helped you to do the same goal with the same complications and same caveats.”