system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] Is Lily really the first person to ever sacrifice herself for her child?

According to most wizarding knowledge, Avada Kadavra has no counter. It hits you, you're dead. Harry is apparently the only person to ever survive, and the question of how this happened is a massive mystery the wizarding world has no idea about.  


As it turns out, it's because his mother willingly and knowing sacrificed her life for him.  


Has that really *never* happened before?  


Two major wars that we know of, and self-sacrifice hasn't happened before? All of wizarding history? This is the first time a wizard knowingly died for their kid, or family, or friends, or lover, or squadmates, or beloved leader, or whoever? Even with the "there needs to be the option of surviving", that can't be *that* much rarer.  


Why is this such a unique and one-of-a-kind moment? Are wizards really that selfish that Heroic Sacrifices as concept were only invented in the 1980s?
gpt
It’s not just standing in the way of someone else’s victim, it’s doing so when the murderer is giving you the clear and explicit opportunity to save yourself.  It’s very uncommon for someone to be psychopathic enough to murder AND give another person the clear chance to save themselves AND have that person sacrifice themselves anyway.  Voldemort offering to spare Lily was already some unusually out-of-character serious business for him, and to further diminish the odds he could have nonlethally pushed her aside had he chosen to.

The fact that it’s described as old magic means that it has to have happened and been documented before, but it’s extremely rare.  Perhaps Harry’s was the first case to involve the Killing Curse.