Talk:The Loyalists/@comment-5739199-20170313020157

"*Killing Cecelia allows Corvo to take her key without conversing with her, but Sokolov or Piero's deaths will result in failure of their side-quest. Samuel and Callista cannot be killed without ending the game.
 * If the signal flare has already been lit, however, it is possible to kill Callista."

I killed Callista like normal, even before using the signal flare, and didn't get a game over.