Prima Killton, one of King Bryce's Royal Knights, was known as the fastest vampire in the settlement and the others could see it as he had dashed across the room in almost a second from the doorway all the way to Arthur.
From the yell in his voice, it seemed he was clearly distressed due to seeing Kim on the floor. Erin, noticing how much anger was in the vampire's voice, could only guess that Kim was somehow related to Prima.
However, Silver knew what Arthur was doing was wrong. The people who he was going after had also killed innocent lives and for what reason, just because they were scared. They were even the ones that attacked first. Which was why she, and it seemed like the others were struggling to move.
The shadows around Arthur started to move, but it looked as if Prima had improved since last time she had seen him fight, as he dashed in even faster, allowing for the tip of his rapier blade to go through the shadow before it could reach his weapon to block its attack.