The three questions are from AMCs
The Walking Dead, in which Rick or someone from his group would ask someone
the following questions.
"How many walkers have you killed?"
"How many people have you killed" followed up by
"Why?"
The exact amount of walkers or people a person has killed
to the point they're not trustworthy is unknown, and asking them why they did it determines whether or not they can be a part of his group, or if they get to live.
The three questions being asked:
"How many walkers have you killed?"
"A couple dozen give or take."
"How many people have you killed."
"Two."
"Why?"
"They tried to
kill me so I had no choice but to kill them, they were gonna take all my stuff."
