Lyle's actions made Ruby shocked. She had stabbed him through the stomach, and even though the wound wasn't serious enough to be called life-threatening, it was not a small injury at all, and yet, he hadn't moved a muscle when he got stabbed, which made her certain that he was not conscious.
Still, he had moved. Right when she had put her guard down and focused on her surroundings, he used that opportunity to strike.
Ruby's mouth opened as she was about to scream in pain, only for Lyle to cover it with his other hand which had a cut on it. He had not only made it impossible for Ruby to scream or utter a single sound, but he had also forced her to unintentionally swallow his blood.
A person would usually scream out if they suddenly felt a sharp pain assault them, which was what Ruby had done, and what Lyle had anticipated.
