1 vamp start
OG - Barzal
N1-Lefty
N3- Ledge (failed)
D4 - no vamps left
2 vamp start
OG - Barzal + X/lefty
N1 - X/Lefty
N3 - Ledge failed
N4 - attempted (presumed succeeded) conversion, so X+Y
N6 - new conversion, so, X+Y+Z
So either we are sitting pretty with no vamps, or we are about to lose the majority