Heidi looked at the prescription bottle, and while not entirely unmoved by his plight, showed no intention to do anything about it. The hesitation in taking her blood, along with the soundless inquiry, proved to be a victory. He was curious, if not interested. Minds like his didn't enjoy the idea of someone having a one-up on them.
The answer. She mouthed, tapped her throat, and started off down the street at a brisk pace. It was better to lure him off the street if she could, away from unsuspecting donors. The man was a vampire, and though it was in a non-lethal, unfang'ed sense, there was the possibility Nathan would use it as an excuse to jab the genius a few times with something sharp.