The arena had the highest security out of all the places in Nebula city due to the tournament happening and the risks that the students were under. There was also the fact that the other cities had sent money to hire more guards. It was always an added bonus for the students since they knew that they would not have to worry about most dangers from the public.
There was always a risk that an assassin or another student would have problems with them. That was just how things worked in this world, Clark knew this well since he had to remain aware of his surroundings at all times. He had already ruffled some feathers when it came to the powerful and corrupt.
