Thesus could tell that he had hit something, but what? He looked into the place, and saw a shocked figure laying on the ground. He smirked, and kicked his body so that he could see his face. But he could tell that he wasn't the thief, cause he didn't have the crown.
Thesus decided it was time to end this feud, he walked down the passage of the firelord's palace and exited through the door, making towards home as it nothing had ever happened.
(He is almost a high master, and is practically a master already, he could possibly control where the lightning went, but it would be slightly unpredictable. I'm out of this topic guys, looks like the thief got away.)