Rick's expression hardened, and he brought his stick over for a bank.

Then Kolovzon's expression hardened again, and he shook his head.

Richard's expression hardened with the implied menace of his words.

He looked at her, appalled; then his expression hardened again.

His expression hardened, and yet became sorrowful at the same time.

His expression hardened to a razor-sharp edge, changing him into a man she hadn't seen before.

But then he glanced back at her, and his expression had hardened.

White's expression hardened, as was typical of those whose reason was only a front.

His expression hardened, but relaxed again when he heard the request.

The boy's expression hardened at hearing his act described as foolish.