Chapter 698: Fighting Voldemort - Harry’s Brave Heart!
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Daphne and Hermione, carrying Draco, and Ron, holding his paining left eye, gave a last nod before walking into the purple fire, their bleeding steps dragging over the floor.
Harry looked as his friends disappeared.
He still couldn't believe it.
Mecha Eye...
Not only did Ron accurately measure all the ingredients without using any scale, but he also carried brew the potions six times in a row following the recipes precisely.
It was like seeing a robot brewing a potion, not human, Harry recalled.
I can see numbers, Ron had shrugged. Every action generates another number, which... synchronize, yes that's the word, synchronize with other numbers, letting me know what I want. It's only happening with the left eye, though.
Harry distinctly recalled Ron losing his left eye during the Chessmen Trial.
That left eye was still lying among the debris when they had left the chamber.