I don't know if it's just a training issue, but it at least has all the markings of one. Past that, it's just speculation about the legality of the stop. If @BigAl wants to know more, he should make an inquiry with the agency; I would.This Ranger seems to have purposely detained a person for longer than necessary with out reason but I can't just assume that is what happened. I am not sure it is a training issue. I see it differently. There are questions that need to be answered. Could be anything from a Ranger abusing some ones time or a system that does not get the information the Ranger needed in a timely manner or...
If the Ranger, his equipment/technology are there other issues in the area that may lead the Ranger to believe more is going on? What ever the reason should have communicated that with BigAl.
If an LEO makes a legal 50 minute stop and the end result doesn't include an arrest or an explanation of why a 50 minute detention occurred, they need some training. Frankly, that should happen at the conclusion of any detention. Who wouldn't want that after being detained even five minutes? I'll bet Ranger would want that if the roles were reversed. It's good manners, and part of being a professional, IMO.