You know what I want to know? In this moment what in the world is Anakin actually thinking when he sees his son staring at him with which sure pure angry murder? I bet he was reminded of the awful day he went to the camp of the Sandpeopke on Tatooine as a jedi and actually went through with the exact same thing. I bet in his head he was saying, "Is this really what I look like to others on the outside through all of my actions of the past?" I do truly really believed this is what Anakin is saying to himself in his head when Luke gives him that angry stare.
No one else but a family member could reach his same level of anger. It was important for Vader to witness that angry murdery stare of Luke's. Nobody else had ever actually looked at him like that not Ahsoka and definitely not Obi-Wan their gazes were more controlled but still more rather surprised than truly angry.
This was something Luke and Vader could find connection with.
This result of waking up someone from their stasis often happens most of the time mostly by accident. It occurs with bullies in the real world. It certainly did with the boy who had a crush on me in middle school. I said I wouldn't go out with him no matter how annoying he was just to get my attention in class. He did think I was cute, but I knew better than to hang out with someone like that thanks to my parents. (Perfect movie where this occurs by accident is Sharpay's Fabulous Adventure, Severely underrated film because of this discovery of Sharpay finally seeing her own weakness and misbelief shatter in front of one of idols who actually turns out to be quite a bitter actress on Broadway.)
While I wasn't the one to teach him a lesson several weeks later he got into a physical fight with a substitute teacher and got suspended from the school. That teacher did what the regular teachers had never been able to enforce beforehand. He was taught a harsh lesson by someone he deemed less in authority and he lost the fight because of overconfidence. I only saw him once we passed each other in the hallway in my freshmen year of high-school. He did not notice me but I noticed him walking down the hallway with probably his new girlfriend. And that time he wasn't behaving erratically then period.
There is another person who wrote a play when someone else has to bravely show another person how rudely and improperly they are behaving is William Shakespeare's "Taming of the Shrew." a story of an elder daughter who is a bully both to her Father and her own sister. It takes the harshness and brutality of a soldier who does know what her anger and brute force is like and how dangerous it is. The film with actress Elizabeth Taylor is exceptional at displaying this action and this time it is done on actual purpose for the sake of the story set up for it.
When it comes to Ben neither Luke nor Han had the connections they should have in order to prevent Kylo Ren from being created. Whereas Luke saw the only time someone get angry at him in a caring way was his Uncle Owen the same person who advised Anakin not to go after his Mom as gently as possible in the past of Anakin's life. Luke didn't recognize or acknowledge his anger was part of him because it was part of his Father like Uncle Owen noticed it, but he never directly admitted it to Luke. So Luke when it comes to the fight with Vader both in Empires Strikes Back and the near end of the Return of The Jedi Luke doesn't recognize he is angry because nobody taught him to recognize his angry fits. But Anakin as Vader does recognize this immediately.
This is the 10th similarity between Luke and Musa they're not always aware they're angry at all at some times.