Who is N. from the nonfiction book, You Will Not Have My Hate?

N. is a friend of Hélène who was with her on the night of her death. Antoine called N. that night, hoping that he could confirm Hélène’s safety. Antoine began to panic and frantically search the city’s hospitals when N. said he was unsure where Hélène was. A few days after the attack, N. and Leiris meet at a bar, at which point N. describes the scene of the attack.