[@TheMinorFall] Feel free to interrupt Kirk -- and/or attack him.  He probably seemed a bit menacing at least that first moment, though once he actually /has/ Amune he's grinning.  If Cain does try to attack, Kirk's reaction will depend on how much danger he's in.  He's one of the guards, so he has excellent training, but nothing to compare to Cain.  Amune will demand Cain stop, though, if he goes after Kirk, so you might not want to take the attack too far, if he would listen to her.