Chapter 13 of fanfiction Harry Potter & The Methods of Rationality by Less Wrong.[link]
Harry help first-year hufflepuff students who were bullied by fifth-year slytherin students. Harry who was foreign to magical world shouted 'abracadabra' which was mistaken for 'avada kdavra' by everyone.
Hufflepuff students : susan bones, hannah abbott, neville longbottom, ernie macmillan, justin flinch fletchey, anonymus
Slytherin students : maito gai, orochimaru, gaara, tobi, naruto.