Oki is also hit in the face with a bookbag by Nanahara, master of the thrown Improvised Weapon.
And when the axe is sticking out of his head Shuya is actually stupid enough to ask Oki if he's okay. There are not enough facepalms in the world. Admittedly, it could be shock.
The hacker student's program running and disrupting the collar control system, all the while showing a cartoon animation of himself scoring a slam dunk.
Quickly followed by, while the military is freaking out, Kitano calmly walking over and shutting off the system.
For that matter, Kitano's death scene. Calmly getting up to answer, then throw, then shoot his cell phone before eating the last of Noriko's cookies.
"Damn good cookie."
From the book, almost every death scene is narrated with a tragic or sombre tone, with a notable exception being all of chapter 70, which narrates Mizuho Inada's death through her... unique inner monologue:
Mizuho calmed her breathing. It was cold, and she was tired, but she didn't really mind. After all, she was about to execute her most important mission...