The Question and Answer section for Divergent is a great resource to ask questions, find answers, and discuss the novel.
From the text:
“You nearly died today,” he says. “I almost shot you. Why didn’t you shoot me, Tris?”
“I couldn’t do that,” I say. “It would have been like shooting myself.”
Marcus Eaton does not appear in Chapter Twenty-Nine.
The initiates are separated into teams, given paintballs guns, and then they play capture the flag.