Lesson learned
Taking justice into your own hands may not be the best decision you could ever make and could lead you to get seriously hurt. Henry was lucky that everything worked out okay for him in the end and he walked away with no serious injuries as a result. But that was just one case.
In reality, many people carry weapons with them, and who knows what would have happened to Henry if that were the case. You should always call the police first before you decide to step in and do something. Sure it’s cool and heroic, but we need to realize that we are not in an action movie.