No. 3 would be O'Sensei's account of the event.
No mention was made regarding the state of mind of the shooters. Based on the information given, any opinions on their "state of mind" would be pure speculation.
Neo is a fictional character in a fiction-based film.
``Aikido Shugyo,'' an autobiography is non-fiction. Gozo Shioda was a real, living, breathing person; as was O'Sensei. Doesn't seem to be any fictional characters here.