Why bother with the carbon freezing at all? Darth Vader along with a battalion of stormtroopers couldn’t have just managed to subdue him and arrest him for his crimes against the Empire? Then once they take him prisoner Vader could say bring my shuttle and toss a handcuffed and guarded Luke in it and fly him up to the Executor. Once they landed he could then have Luke thrown in the brig where he could then have a long talk with him about their relationship and his options. Isn’t that how a real military would do it if they were on a mission to capture someone important? Instead of something believable we got some elaborate plan where Vader meets Luke alone and tries to get him in a carbon freezing chamber which fails and then they duel with lightsabers. How contrived.