John listened. He might not care about people the way he had before this life, but he still saw little point in abusing or torturing the innocent. On a practical level it only made you enemies. While that could be fun, like the bar fight, it could get out of hand if you pushed your luck too far.
He thought he might try giving pleasure. He knew how to feed, and wasn't hungry enough to have to overly control himself, but his glamoring ability was still only just being tried.
He moved to sit beside the woman, turning her towards him, smiling reassuringly. She smiled back, and he leaned in, unable to stop his teeth from popping. Still, he focused on control, and leaned in slowly, kissing her neck just above the vein and letting her inhale before smoothly sliding his teeth in.
The blood that rushed into his mouth nearly made him sigh, too. He was full enough from the synthetic drink, but the taste was so much more... purifying.
After a moment he refocused and slowed his feeding, working to be more aware of her body and how it felt for her. He didn't know exactly how to do the things Pam was describing, but he let instinct and reaction guide him.