John listened, waiting for Melody to put everything to words. When she mentioned that she was no longer feeding off of purely death, his expression went grim. It sounded like her powers were growing, fast, and she didn't seem thrilled about it. He glanced around, trying to imagine what it was like in a City bursting with energy for her. He imagined it was something like his first few days, when the bright lights and continual noise were overwhelming his newly enhanced senses. Probably worse, though, he didn't think channeling enough energy to create explosions probably felt all that nice.
Then her words registered with him and he slowed, putting an arm up in front of her to make her stop. "Whoa, there, hold on a moment," he said, eyes narrowing. "Somebody tried to shoot you?" Mel may not have been a vampire, but she was part of the nest in John's mind. She'd been there longer than him and her closeness to Pam made her important.
He didn't want to ignore what was clearly troubling her, and didn't have the faintest idea how it was possible or what it would mean if she couldn't die. Still, he was programmed by years of training to tackle problems based off of immediate threat, and the idea of anybody attempting to harm her riled the dangerous parts of his nature. Immortality was a long term subject.