The guard stiffened, his eyes wide with shock, then dropped face first onto the floor.

He turned, and the guards stiffened to attention, ready to respond the moment Basil issued commands.

As he shoved the papers back through the window, the guard stiffened into the stance of a salute.

The guard stiffened, afraid to look behind him for fear of giving Gannon an opening.

The guards stiffened to attention, lifting their lances to the vertical.

The guard stiffened in the grip of the hairy ones.

He could see the two guards stiffen, standing at the ready should anything go wrong.

The guards on the low, broad stairs stiffened to attention.

The guards stiffened as the two Commerce officials rose from their chairs.

The guards stiffened to parade rest, but they'd been attentive even before their commander appeared.