Polyjuice Potion and the Infiltration Plan (VI)

"That was your core muscles reacting." Hermione walked ahead without looking back, her voice coming from Pansy's mouth with a strangely jarring effect. "Polyjuice Potion synchronizes the imitator's physical qualities, including muscle memory and magical attributes. You now have more than Goyle's appearance—you also have his reaction speed, strength, and even some instinctive combat intuition. So if you run into danger, don't overthink it. Let your body react on its own. Goyle's fighting instincts might be more useful than yours."

Ron froze for a moment, then his eyes lit up. "So I can use Goyle's fists to beat up Malfoy?"

"Drop that dangerous idea," Harry said in a low voice. "We're here to gather intelligence, not start a fight. If you hit Malfoy, we'll all be exposed."

"I was just saying." Ron grumbled, but a gleam of eagerness flashed through Goyle's tiny eyes, buried deep in layers of fat.

They headed down the corridor, passing one spiral staircase after another and one dozing portrait after another. It was late, and the castle was quiet. Only their footsteps echoed over the flagstones, along with the sound of Ron's robes scraping against the walls as he walked—his body was so wide that ordinary corridors barely allowed him through. Whenever they came across a stone pillar jutting out at a corner, he had to turn sideways to get past.

"How does Goyle usually walk?" Ron complained. "I feel like a rhinoceros stuffed into a pet carrier."

"How he walks isn't important," Hermione said. "What matters is how you should walk. Goyle doesn't lift his head when he walks. Look, his neck is short, so his gaze stays level, or even slightly downward. Don't keep looking around like you normally do. You need to give people that dull feeling of 'I'm not interested in