This is Eric's head. This is Eric's head with a bullet through it. Any questions?
Eric's dead, and Jack Kang is shocked because now he can't meet one of the demands, which was to return Eric to Jeanine. She probably doesn't want the boy for his corpse.
All the Dauntless run to Dauntless headquarters to reclaim it.
But first, impromptu paintball fight. No, really: we know we snarked about this in chapter 15, but it really happens: a paintball fight breaks out. And these people are in charge of the safety of the city? Can we request a transfer?
They're supposed to be shooting paint over the security cameras (is unplugging them too difficult?), but they get carried away and shoot each other instead. Um, fun?