His movements were quick. It happened so fast that they couldn't react or do anything to stop him. His blade cut into the neck of the Viper and it disappeared. The head of the Viper didn't come off since it was saved by the world fragment but he wasn't disappointed. He saw all the threads snap off at once. The sudden disconnection of that many threads created a type of energy that would be imperceptible in lower quantities.
This energy existed in the brief window when the connections were disconnected. The threads are exposed to the physical world during that instant. It had escaped his notice before because it was too small to notice but now he saw it and he also knows that if he has the right tools he can snatch these threads and take them for his own.
"Very interesting." He mused out loud amidst the cry of the Vipers.
