He could see the exhaustion - Thranduil was very familiar with that emotion, after all this time.

"I worry only for the state in which I shall find it, should I be allowed to return," Thranduil said softly, posture changing to something slightly more supportive. He was ready to pick Legolas up again and carry him, as he had so often so many years ago, if it were necessary. "You should sit down." And rest. Elves could withstand much, but it still took their bodies some time to recover.