Professor Quirrell then turned back to where the Potions Master lay sprawled, bent over and placed his wand on Professor Snape's forehead. "Alienis nervus mobile lignum."

The Defense Professor stepped back, and began to move his left fingers in the air as though manipulating a puppet on strings.

Professor Snape pushed himself up from the ground by smooth motions, and stood once more before the corridor door.

From Chapter 88: Time Pressure, Part 1, before anyone knows about the troll yet:

"You know," Harry said, as he turned his head away to stare at the ceiling illusion of a clear blue sky, "that still creeps me out sometimes."

"What does?" said Fred or George.

The powerful and enigmatic Defense Professor was 'resting' or whatever-the-heck-was-wrong-with-him, his hands making fumbling, hesitant grabs at a chicken-leg that seemed to be eluding him on the plate.

Are there any other times that Quirrell is described making similar gestures? (Note that another time he apparently controls someone else--the centaur in Chapter 101--he doesn't do this, but that may be due to the centaur actually being dead as some have speculated.) [Edit for Ch. 106: Confirmed; the centaur and Fluffy became Infieri.]