"It's for my chronus hemorrhoids, it's a hazard of time travel." The old man sucked at the twisted paper like a pacifier. The battle seemed to have shifted, as the better dressed French soldiers began to retreat a bit.
  "So, you were saying about the litmus test," Barry reminded.
  "Sorry, the memory," said the old man. "It's hard to stay in the moment, if you know what I mean? Yes, the litmus test is whether you think the French Revolution brought a change, as it's name would suggest, or whether you emphasize the Reign of Terror?"