Ezra casually walked to the arena, he had waited for Seth to go to the bathroom to then switch with his clone and escape the dorms using shadow dive. He had to say, he had a good ability set to be an assassin of sorts
He got to the arena, seeking around to not get caught, he found and open door, so whoever wrote that paper was already in there, maybe with the person it was meant for as well.
Up to this point, Ezra had failed to see that the paper and the torn out pages had little to no correlation, but it was not his fault, but events lined up perfectly, so he had to come to a conclusion that the person that was the culprit had something to do with someone that had some kind of Interest in the dark ages.
Ezra walked in the dark arena, he decided to climn up to the seats, he got a seat not too high up and not too close to the arena, just perfect.