Bill smiled and nodded once, "I'll be here for you, Navi." He kissed her forehead and then chuckled softly, "He showed up seconds before I walked out th'door to come here. What I've got isn't near as legitimate a source as a willin' donor."
He might have needed to get out some pent up aggression and self-loathing, so he'd gone and found a mugger to drain.