The Vampires and Renfields had all huddled in and piled on to protect Dominka from the fire as tendrils of sentient shadow stretched out along the ground from her, hitting the barrier of the circle and collapsing it as Charlie Weasley and Norberta made a second pass, strafing the ground with fire. It was Dominika's blood, alright. As the formerly-trapped wizards saw the dragon coming down again, Severus and Fleur grabbed Harry and Ron and made their way back towards the tunnels as the fire splashed down onto the pavement, mere meters away.