Upon seeing Sil's face come on screen, the vampires wondered who he was. There was a couple that recognized him as someone who had tried to help stop Fex's execution; at the time, he had used two blades and only had the strength to put up with a vampire knight but couldn't even defeat one.
So they were wondering just how come this person was invited as one of the strongest humans. What they didn't know was at the time, the one they had seen fight was actually Vorden, nor did they know about his powers since he was unable to copy vampire MC cells.
Inside the other glass container, Sil had just requested for the others to help him out.
Of course, unlike the vampires, everyone in the room knew of Sil's power since they had seen him and his family defeat the five spiked Dalki, known as Slicer.
Surprisingly, the first one out of everyone to approach Sil was Mona. She walked forward, leaving her large friend by her side and held onto Sil's hands.