Harry wondered how many centaurs were watching their procession pass; he dared not open his eyes to look.
Behind her stood the remaining teaches, including the palomino centaur, Firenze, and the members of the Order of the Phoenix who had arrived to fight.
Some of the Death Eaters called insults at the centaurs as they left them behind.
The centaurs Bane, Ronan and Magorian burst into the hall with a great clatter of hooves, as behind Harry the door that led to the kitchens was blasted off its hinges.
McGonagall had replaced the House tables, but nobody was sitting according to House anymore: All were jumbled together, teachers and pupils, ghosts and parents, centaurs and house-elves, and Firenze lay recovering in the corner, and Grawp peered in through a smashed window, and people were throwing food into his laughing mouth.
In one swift, fluid motion, Neville broke free of the Body-Bind Curse upon him; the flaming hat fell off him and he drew from its depths something silver, with a glittering, rubied handle — The slash of the silver blade could not be heard over the roar of the oncoming crowd or the sounds of the clashing giants or of the stampeding centaurs, and yet, it seemed to draw every eye.
The charging centaurs were scattering the Death Eaters, everyone was feeling the giants’ stamping feet, and nearer and nearer thundered the reinforcements that had come from who knew where; Harry saw great winged creatures soaring the heads of Voldemort’s giants, thestrals and Buckbeak the hippogriff scratching at their eyes while Grawp punched and pummeled them and now the wizards, defenders of Hogwarts and Death Eaters alike were being forced back into the castle.
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Firenze is the name of a centaur character in the Harry Potter stories.
In Greek mythology, Chiron is probably the most famous of the centaurs. He is known for his wisdom and knowledge of medicine.