Clef wasn't sure who this was, but he could take an educated guess from the brief message Link sent. His suspicions were solidified when he arrived and saw the person attacking Link. He added his own shields around the boy.

"Light at the corners when you want it dropped," he said softly as the shields around himself merged with the ones around Link as he got closer. But after a glance to make sure his son was unharmed, his focus was on the shields themselves. And the foe.