1.   And, as Silas stood listening to her, Lucy noticed his jaw tighten in anger.

2.   Colin felt his jaw tighten.

3.   She glared back at him, feeling a momentary quiver when his jaw tightened even more, setting that betraying little muscle beating in a furious tempo.

4.   His jaw tightened and his features looked suddenly cool and remote.

5.   But his jaw tightened.

6.   Hayama, one of dozens of modern kataribe who pass on the oral tradition of the atomic bombings, paused and his jaw tightened.

7.   Vukovic looked down, his jaw tightening.