A man's shield can protect him in only one plane of attack.

It was a shield, protecting her from the intensity of his dark brown eyes.

As he turned, she thrust hard at the shield protecting his heart.

The shield of his faith protected him from the strangers' eyes.

She was already fine; a translucent shield protected her from the universe.

"But all the years I had felt there was a shield around us, protecting us."

She left unsaid that her shield would not protect against these Sisters.

Now, not only was her king dead, but the shield of his memory protected her no longer.

No more mental shield protecting the angel from the demon.

She acts a little ditzy, but uses that as a shield to protect herself.