[Luck is in Khan's favor. Spock was not in any mood to let this fight go unfinished. He made his claims and they were rejected--skewed even--to suit this man's agenda. How the Captain managed to forge cooperation between the Enterprise and this man is still unclear. Uhura's voice is what has him holding back no matter how hard he has his fists clenched.
And the way Khan shoves her. He could punch him for just that much.]
Lieutenant this none of your concern. [Truly, he isn't meaning to be cross with her, but even his rage can't be quieted at times.] While I admit it is unwise to display such violence, I will not yield to a murderer.
[He has his own hard stare for Khan, but he does nothing more and says nothing more. He knows better than to incur Uhura's wrath.]