Nanashub's huge flat face lost its neutral mask, and his brow furrowed.

A flicker of recognition passed over the neutral mask Sir Jehan was trying to maintain.

The Doctor didn't miss the barely perceptible start, quickly replaced by a carefully neutral mask.

I retreated inside and put on a neutral mask.

Terisa glanced at Geraden; but his features were composed into a neutral mask.

Metesky saw a flash of deep resentment before it was submerged behind a neutral mask.

Her voice was once again the way it had always been, her face once again a neutral mask.

His training involved an emphasis on masks, starting with the neutral mask.

She shrugged, returning her face to a neutral mask, and stared out the window.

The character mask therefore provides less flexibility than the neutral mask, because if the actor falls out of his role, the act is simply not convincing.