From the moment he entered the courtroom for his long-awaited sentencing for the quadruple murders of four University of Idaho students, Bryan Kohberger projected what experts described as a cold, robotic presence.According to body language expert Susan Constantine, his frozen posture, sunken appearance, furrowed brows, and manic stare suggested a man attempting to control the courtroom with "covert hostility" masked as indifference.His mask at times cracked in subtle ways as he was sentenced for the murders of Kaylee Goncalves, Ethan Chapin, Xana Kernodle and Madison Mogen and listened to the emotional victim impact statements.BRYAN KOHBERGER TRANSFERRED TO MAXIMUM-SECURITY STATE PRISONConstantine told Fox News Digital that his body language communicated "emotional detachment" as he sat rigid in an orange jumpsuit and shackled ankles listening "intently" throughout the multi-hour sentencing.Body language expert and defense attorney Linda Kenney Baden described Kohberger as "an empty vessel filled with hate," telling Fox News Digital that despite his efforts to appear unbothered, his emotions at times betrayed him."Involuntary blinks, winces, breathing shifts, and occasional postural slumping," Baden said.In one photo, Kohberger was seen shaking hands with one of his defense attorneys, Elissa Massoth, who is facing him. Kohbergers expression is tense and composed, his lips pressed into a tight line as he maintains a fixed, forward gaze.Massoth, known for her work as a capital-qualified defense attorney, appeared professional and engaged at the moment, while Kohberger appeared rigid with his eyes piercing past her.As victim impact statements kicked off Wednesday, his mask cracked in subtle but telling ways, like incessant blinking, leaning back, and tightened jaw movement, particularly when his ego was directly challenged by the families statements, Baden said.In Aliveas victim impact statement, Constantine observed Kohbergers "rapid blinking" following each emotional jab.Kaylees older sister delivered a scathing rebuke of Kohberger, saying that he was "not profound. Youre pathetic."Constantine said that Kohbergers escalating blinking signaled "discomfort and ego disruption" as Alivea issued her "sharp and condiment tone with an edge of condescension and snarkiness towards Kohberger."IDAHO VICTIMS' FAMILIES TO ADDRESS KILLER DIRECTLY AT KOHBERGER SENTENCINGBaden called Aliveas statement the "star of the courtroom," saying that she had "rattled the snakes head off."Her takedown included rhetorical questions challenging his motive and intelligence."What were Kaylees last words?" she asked. "Do you feel anything at allor are you exactly what you always feared? Nothing.""You didnt create devastation. You revealed it, and its in yourself," she said. "That darkness you carry, that emptiness, youll sit with it long after this is over.That is your sentence."As Kaylees mother expressed that Kohberger "stole her peace," Kohberger remained stone-faced."When youmurdered my daughter, you shattered others. You stole my peace. You altered my every waking moment," she said.Both Constantine and Baden pointed to Kohbergers subtle shoulder tension and tightened jaw as Goncalves landed another emotional punch."I wish I could crown you with a jester hat," she said. "Go to hell."Constantine and Baden said that Kaylees mother's sarcastic jab at his "genius" status and calling him a "joke" assaulted "his constructed self-image."BRYAN KOHBERGER TRADED DEATH PENALTY FOR LIFE SENTENCE THAT COULD STILL END VIOLENTLY BEHIND BARSKaylees father, Steve Goncalves, physically moved the podium to confront Kohberger eye-to-eye. It was a "direct power reversal," Constantine said."The worlds watching because of the kids, not because of you. Nobody cares about you," he said. "In time, you will be nothing but two initials, forgotten to the wind."He called Kohberger a "joke" and described how easy it was to track him down."Police officers tell us within minutes they had your DNA. Like a calling card. You were that careless. That's foolish. That's stupid. Masters degree? Youre a joke. Complete joke," he said.As Goncalves "downgraded" Kohberger from criminal mastermind to sloppy coward, Kohberger leaned back, the only full-body reaction noted by Constantine.BRYAN KOHBERGER PLEADS GUILTY TO IDAHO MURDERS"His full-body reaction [to Steves statement] was indicative of discomfort, retreat or shock," she said.Laramies voice, though quieter, hit a nerve, Baden said.The body language expert noted that Kohberger winced and his "breathing changed" as Laramie spoke about Maddie.Laramie said the tragic loss of their daughter has left a "vast emotional wound" that will "never heal."FOLLOW THE FOX TRUE CRIME TEAM ON XConstantine noted Kohbergers "emotional void" as Xana Kernodles older sister spoke, declaring: "Her light still shines, and her voice will echo louder than this pain. You didnt take that from us. And you never will."WATCH:SIGN UP TO GETTRUE CRIME NEWSLETTERBaden noted a shift in posture as Xana Kernodles aunt offered an olive branch in forgiving Kohberger and offering to talk."For the first time, Kohberger slumped slightly, exposing his stomach chains, perhaps revealing fatigue discomfort, or unacknowledged remorse," Baden noted.Fox News Digita's Michael Ruiz contributed to this report.