Of course, when he'd been a new vampire, it had taken him a while to learn how to control his blood cravings, and he had taken blood directly from humans. Occasionally, he'd taken too much and had accidentally killed humans. Over the years he'd learned to control himself better. When blood had become more readily available on the commercial market, he'd switched to it.
As he slowly lifted Isabella's hand to lips, he hoped that he wouldn't loose control, as the last thing he wanted to do was to hurt her. He could sense that she was afraid from the look in her eyes, and he hated that he was the cause of that. But he had to do this.