1) The video this fan recorded is not the same, as from the official performance. This is unusual and bares the question - what was an obsessed fan doing there during a presumable rehearsal/another take/etc. and why was she the only one allowed to film, how did she come so close in contact with Hyunjin to get his autograph and what is happening behind the stage....
Original recording of the performance
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Her recording, where you can notice that it is not the same as the original - in her recording, Hyunjin slightly stumbles at some point and when he starts walking on the stage, in the original performance he starts with a pirouette and his entire walk on the stage up until the ending is different than from the original recording.
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2) I mentioned yesterday that I am going to comment separately on Hyunjin's performance, so there it is - his augmented stiffness is proof for lack of practice and the insecurities are noticeable. Unfortunately what made him once special, is simply gone, he has limited everything to stiff movements, unclean execution and same "too cool for school" dumb expression as Jungkook and Taehyung, because he's focused on stupid appearance dumb effects, rather than the interpretation of a dance.
I found these on the internet, credit to the user, but you can notice the easiness and the facial expression during the same movement and compare it with AMA's performance, where he couldn't jump, couldn't raise easily his legs and was making this dumb JKT face.
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3) this is M countdown, or Ingikayo something "staff" . Sure....
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I hope, that Hyunjin finds his beauty back. What made him special on stage it's inside the soul, not in the face, not doing some dump rapper hand movements, and not without practice.