Yisha told Han Sen he had to prove himself if he wished to obtain more resources. So, Han Sen wanted this opportunity to show off. Now that this man had willingly delivered himself on a platter, Han Sen wasn't going to let this chance slip away.
The man, who was named Gauss, looked at Han Sen angrily. If Han Sen had been using the Earl horse knife, he assuredly wouldn't have been as enraged as he was now.
But Han Sen wasn't using the horse knife, and neither was he using the knife he had been keeping with him. He just picked up a random blade off the ground. It was insulting, and that only fueled Gauss' anger.
"I want to see how cocky you can get." Gauss brought out his own pirate knife. It was just a little bit shiny.