Now that would be an interesting movie. You have a guy who really loved action hero movies as a kid and spent his life honing those skills. Not because he really wants to kill anyone, but just because it’s fun. He spends his professional career as a mundane office worker until one day a group of terrorists take over his office building and plan on killing everyone inside. He has to fight his way through multiple floors of trained killers to get to the top so he can take down the chief bad guy, The Raid/Judge Dredd style. Realistically, he would definitely die within like 2 minutes from getting shot in the back of the head, but it’s still a fun setup for an “unlikely hero” action movie.