As for Vader, he was changing already at the end of ESB. His encounter with Luke started an internal conflict, or reawakened an old one. Note nobody gets strangled for letting the Falcon escape.
Having seen Empire Strikes Back hundreds of times on VHS and SD television, I don’t think the resolution was ever good enough for me to notice Vader turn his head and look over at Piett in the last couple frames where he’s walking off the Executor bridge. The camera just cuts to him from behind, and for all we know he’s looking at the ground, completely lost in his thoughts and oblivious to all the officers who are standing nearby afraid for their lives.
It was a negative surprise for me when I was watching Despecialized recently and caught that head turn, and I think it diminishes the scene a little bit. I think it could have been better directed, or at least cut a few frames sooner.