Harry's amplified voice boomed overhead. "The Minister is down. Aurors and Hit-Wizards, fall back and use fire against the undead. Fiendfyre works best! If you're bitten, you're dead, so FALL BACK!" Minerva was surrounded by the faster Inferi and she transfigured the ground around her into a pit of lava, killing herself and all of the Inferi that blindly shuffled forward into it.