Earlier quoted context omitted.
One day it just hit me: "I could totally give my life for this child". It came out of nowhere and it was a chilling and somewhat unnerving feeling. I never felt that for anyone. But the conviction is there, almost like a peaceful resignation: if there is no other solution and that is the only possible alternative then so be it. Crazy.
It's funny, this was one of the reasons I always found Harry Potter so overrated. So Harry has super special invincibility from The Killing Curse because Lily sacrifices herself for him. This is described as "Ancient, Long Forgotten Magic" Wouldn't literally any parent do this? Why aren't they're dozens of boys/girls who lived?
(Assuming I haven't mixed up canonical Harry Potter with Methods of Rationality.)