Kirk: "What's happened?" Spock: "We have fired on the chancellor's ship." -

Related:

• Kirk: "We haven't fired." Spock: "Captain...according to our databanks we have.
  twice." -- "STVI:TUC", Stardate 9523...
• Spock: "We must endeavour to piece together what happened tonight.
  According to our databank, this ship fired those...
• Kirk: "Don't crucify yourself, it wasn't your fault." Spock:
  "I was responsible." Kirk: "For no actions but your...
• Kirk: "My I present Captain Spock, whom I believe you know." Gorkon:
  "Captain, face to face at last. You have my thanks...
• Azetbur: "What's happened? What's the meaning of this?" Kirk:
  "It's about the future, Madame Chancellor. Some people...
• Chekov: "And if we cannot peice together what happened?
  What then, sir?" Spock: "In that case, Mister Chekov...
• Kirk: "We volunteered?!" -- "STVI:TUC",
  Stardate 9521...
• Chekov: "I do not understand. If there was a ship underneath us,
  surely the assassins beamed aboard from that wessel...
• Spock: "They are dying." Kirk: "Let them die!" -- "STVI:TUC",
  Stardate 9521...