Disclaimer: I am not George Lucas or J.K. Rowling.
Enter Minerva, holding her lightwand to Malfoy's neck.
Yaxley. Master McGonagall. How pleasant of you to join us.
Minerva. This party's over.
Minerva signals, and at strategic places around the arena there are sudden flashes of light as about two hundred Aurors switch on their lightwands: Caradoc Dearborn, Elphias Doge, Sturgis Podmore, and Emmeline Vance in the balcony; Dilys Derwent, Marlene McKinnon, and Dirk Cresswell in the arena; Katie Bell at the doors.
Yaxley. Brave, but foolish, my old Auror friend. You're impossibly outnumbered.
Minerva. I don't think so.
Yaxley. We'll see.
Thousands of droids start to pour into all parts of the arena.
Malfoy fires his flamethrower at Minerva, igniting Minerva's robe. She jumps into the arena. Acromantulas fly away everywhere. Two Aurors throw James and Sirius lightwands, while Lily picks up a stray rifle. The cerberus bucks them off and runs off.
In the midst of the battle, the Inferius-headed Percy enters the arena.
Inferius Head. My legs aren't moving. I must need Magical Maintenance.
James immediately cuts down an Inferius, and Sirius cuts down two more than that. Lily jumps on a reptilian mount, pulling a chariot that James jumps in, all striking down Inferi droids.
As Draco watches with interest, the Percy-headed Inferius marches in.
Percy's Head. What's all this noise? O! A battle? This must be some terrible mistake. I'm programmed for etiquette, not destruction.
Minerva jumps over an Inferius commander, and fights beside Sirius.
Sturgis decapitates the Inferius-headed Percy.
Auror Knight Cattermole attempts to kill Yaxley, but is killed by Malfoy.
The charging cerberus causes Sirius and Minerva to break apart.
Malfoy. [to Draco] Stay here, son. I'll be back.
Malfoy takes off into the air and chases after Minerva running from the cerberus, who knocks Minerva's weapon out of her hand. Malfoy lands and lunges for the weapon, but Minerva takes it and the Pureblood falls. The cerberus tramples over the bounty hunter, who gets to his feet and kills the cerberus.
Malfoy attempts to take off, but his jetpack is damaged, and he is decapitated by Minerva McGonagall.
Yaxley looks angry, and Minerva mourns for the loss. Draco, however, watches his father's death with great dismay.
Exit all.