Had a kind of wild light in his eyes, you might say.

The wild light had left his eyes for a moment.

The wild light of the web burned about him.

There was a wild light of fanaticism in his eyes.

Martin saw the wild light of battle in Boar's eye.

He was smiling, and a wild light burned in his eye.

She had a wild, stubborn light in her eyes.

The dark brown eyes gazed straight up at the ceiling and had a wild light in them.

There is a strange wild light in his eyes, something fierce and feral.

His voice lifted on the last sentence and a wild light came into his eyes.