^ It's interesting that the person pointed out about lip-reading, because afterwards when Kylo sees Luke emerge from the smoke, you can see Adam murmur something along the lines of "shut up"... It's been a while since I've seen the movie, so I'll have to re-watch to clarify this, but you can tell there's a mental dialogue between them in that moment where Luke is warning Ben not to defy his Teacher and Kylo is mastering the technique of trying to stay cool and collected whilst actually having Ben inside him being terrified
Adam's a great actor because he shows these little details in the character which somebody else might not bother to do. He quivers and shakes in the aftermath of trying to being threatening, which depicts Ben's memories of fearing his Uncle.
Also, I think in the GIFs you posted, he's also shaken up because he's physically exhausted from exerting so much energy on firing the shots towards Luke.