It didn't need to be said. Cid had heard about what had happened at Nibelheim from Cloud, and even if the story might have been a little skewed it was still a story. Sephiroth went nuts, destroyed a town and royally fucked up Cloud's life.

"What the fuck do you want me to do?" Cid snapped back, with only a minimum amount of real anger. "It ain't like I can call him back."

And really, even if he could he wouldn't have. No need to grab the wrong one.