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ikrase comments on Harry Potter and the Methods of Rationality discussion thread, part 20, chapter 90 - Less Wrong Discussion
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Yeah. We've seen him be unable to break magical locks with transfig.
Where? We've seen magical locks resist all types of charms except the unlocking charm, but I don't recall magical locks being attacked by !Harry's transmutation powers.
He tried to transmute the lock and hinges of the door Draco locked him in.
With ordinary transmutation, not partial; evidence for locking spells preventing ordinary transfiguration. That partial transfiguration was considered impossible at the time the locking spells were developed is evidence that it can bypass them.
It would also be odd and useful if the locking spell allowed the casing to survive the kind of physical force that could be provided by a transmuted vise. Harry should know enough about mechanics and materials to create something which can produce both the force and precision needed to destroy the casing without harming the time-turner.
According to Quirrel, Draco's padlocked-glove-Colloportus trick would withstand 'lesser material forces', implying that it had, at the least, limited tensile strength. (Infinite hardness would be less wierd.)
I don't see why partial transfig should be any easier to break locking spells with.
If Transfiguration can create prestressed objects, (and Partial Transfig almost certainly can) it should be possible to make some very powerful one-shot equipment without liquids or gases. (this includes the transfiguration grenade I mentioned elsewhere.)