"Solid magical energy?  Oh, that's great."  Jake frowns as he reads through the folder.  "So whatever's doing this probably hasn't got a grudge -- more likely it's just picking targets it thinks it can get away with."  He glances up.  "And as far as we know it's just Leeches and mages, not Garou or whoever else hangs out in Sanctuary...so either it hasn't got a use for their blood, or it's just not strong enough to risk jumping one of them."