The Frostpeak crew was free to do whatever they wanted. Arthur only asked for Kai to cover up Dara for the time being, as Runo could recognize her, and that would ruin their operation. Dara had no problems with that, so everything was good.
Arthur spent most of the day resting, eating, and trying to gather as much information about the illegal fights as he could. There was almost nothing, but Arthur was sure they were a lot of rich people betting on these fights.
When the sun set and the moon took over the sky, Arthur dropped everything he was doing and went to the place where the fights would happen. He wore the same clothing underneath. The only addition was a black-cloak with a hood and a mask.
"Death Claw? Let me see here."
The guard had the names on the formularies they had to fill, so he just looked up, and after 1 minute, he saw Arthur's name was on the list. Arthur was using the name Death Claw for these illegal fights.