*ahem*
So, Z was hunting one day when he found this Worker Drone hunched over another WD's body, crying her eyes out. At this point, Z had gone rogue and separated from his squad, so his first instinct was to see what was wrong. Push turned to shove when X and Y (Z's former teammates) tried to kill Emily, and Z defended her. This happened a few more times as Z tried to get Emily to a place where she would be safe. Eventually, they made their way to Emily's colony, who agreed to look after Z after he defended their bunker from X and Y.