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It's a little known fact that Vastra does not enjoy drinking blood as much as she used to. Horrible memories that she'd give anything to forget would suddenly come rushing back all at once; memories of fiery explosions, of desperate cries for help, of widespread death and destruction. Whenever Vastra looked at her reflection in the glass, what stared back at her was an angry and blood-soaked monster hell-bent on revenge at the expense of innocent lives. Guilt stabbed at her heart, but Vastra drank the blood anyway, its intoxicatingly bitter and irony taste washing over her tongue and then down her throat. Though the dead can never be revived, at least the blood will help to purify Vastra of her past sins and grant her some closure in the present.