What are the conditions required for a hero to fall? As long as the hero wants it, he can.
Many people died in the war. If there is a chance, even a slim chance...
Harry Potter is not a person who is immersed in memories and cannot get out. However, this opportunity is right in front of him. He only needs to pay some price to go back to the past and change these tragic endings.
Death is not the end, but the beginning of another adventure.
There are OOC, Snarry