Part of my discontent with book 7 was the lack of any sort of understanding between Snape and Dumbledore. We get a tantilizing view of exactly the sort of bargains that Dumbledore was willing to make in his drive to defeat Voldemort, and Snape's realization that he was as much at Dumbledore's mercy as was Harry. A scene between them (not necessarily how I wrote it but something) was necessary. Glad you enjoyed!