Sylvester sensed some doubts in their minds. So he decided not to push it as antagonizing them might have the opposite effect. This was the rule of taunting, don't do it so much that the other person feels obliged to respond.
Instead, Sylvester kept staring into the eyes of Null, who was undoubtedly the leader of these Void Keepers.
There was a fierceness in Sylvester's eyes as he started the man down. He made it clear that what he said was not an empty threat. Yes, he would go to any length to kill them, no matter how long it takes. He has done it once, he can do it again.
Of course, Null didn't know it but just looking into Sylvester's eyes made him feel subconsciously small as if he was in front of not a young boy but a seasoned veteran who had seen all the evil that the world had to throw at him.
"Hehe! You're threatening us? Little youngling… yo-"
