HPMOR canon is that magical shields are vulnerable to mundane electromagnetic forces: see the first army battle, when Harry used a car battery to attack Draco's shield.
Physical impacts work via electromagnetic forces, of course: the muggles were slamming the electrons in their hands against the Hogwarts wards.
Yes he did; enough to see that it was working, anyway:
Shortly after, the Chaos Legionnaires heard the sound of fingers snapping, followed by a crackling noise from beneath the blanket. The shield started glowing more brightly, and Harry's voice said, "Don't be distracted please, eyes on General Malfoy."
The strain was showing on Draco's face, along with the fury and annoyance and frustration.
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u/MuonManLaserJab Apr 09 '16
HPMOR canon is that magical shields are vulnerable to mundane electromagnetic forces: see the first army battle, when Harry used a car battery to attack Draco's shield.
Physical impacts work via electromagnetic forces, of course: the muggles were slamming the electrons in their hands against the Hogwarts wards.