Though he still had some contact with the Key, his breathing immediately changed.

The kanka looked at her naked body and his breathing changed.

In less than a minute his breathing changed and became heavier.

His breathing did not change, but something made her look at him again.

Her eyes were still closed, but her breathing had changed.

I slowed my pace back to a walk when his breathing changed.

I tried to lie still, but I knew my breathing had changed.

Her breathing had changed, and when she stood, she seemed taller.

She grew quiet for a moment, and her breathing changed.

Richard's breathing changed, quickened, and I knew he was close.