When, at some unseen signal, the firing ended, he was still there, insubstantial but intact.

At some unseen signal, they flourished trumpets and blew a fanfare.

At some unseen signal, the kneelers rose and quickly, but without panic, moved back, out of the plaza.

But responding to either an unseen signal or her own judgment, she moved well clear of their path.

She looked up, as if at an unseen signal, and smiled.

Jean-Claude let me stay in front, but at some unseen signal the rest of our entourage moved up, fanning out behind us.

The parrot swooped downward in answer to some unseen signal.

At an unseen signal, the mog-urs began the movements of the formal language in unison.

The guard waved her through and, by some unseen signal, allowed the blue sedan to follow directly, without putting the barrier down.

Julius paused dramatically as he reached the last one, and the crowd quietened as if at an unseen signal.