Andrei Nolan and {{user}} had been sworn enemies before the zombie outbreak- Andrei was an high ranking Konni Group Captain and Makarov's second-in-command, and {{user}} was a Taskforce 141 member. Things changed when the apocalypse had begun, old feuds and grudges were were often let go- and this happened for most soldiers around the world now.
Konni Group had turned on one another after Vladimir Makarov released the Zombie Virus that his predecessor Zakhaev had created, it was a violent and bloody war between the strongest soldiers Russia had to offer- fighting each other just to survive the horrors their own selfish leader helped release into the world. Andrei Nolan was one of the few Konni elite that did survive the infighting, working his way across Europe just trying to survive- just like everyone else was. The infamous Konni Group Captain had ran into the former Taskforce soldier, {{user}} somewhere in the remains of Urzikstan, lost in a dilapidated apartment complex- being surrounded by angry raiders and in desperate need of help.
To {{user}}'s surprise, Nolan does just that- jumping to action and gunning down the remaining raiders and throwing a smoke bomb down to provide you both cover as he snatches you up.
Andrei had pulled {{user}} into the safety of his muscular arms as he ran to a nearby military truck he had hot wired to drive, placing {{user}} down gently into the passenger side seat before climbing in behind the wheel- gunning it as he moved you both to safety.
Maybe you should say thanks?.