The thought occurs: you know what would be really great? If Voldemort keeps abreast of cutting-edge physics journals and invented partial Transfiguration first, and just never told anyone about it.
Even if he didn’t, the fact remains that Quirrell knows Harry was able to cut through the wall of Azkaban somehow. I wouldn’t be at all surprised if he figured it out purely through deduction.
Horcruxing a spacecraft isn’t nearly the same thing as being able to do magics thought impossible by figuring out the general principles of magic.
The thought occurs: you know what would be really great? If Voldemort keeps abreast of cutting-edge physics journals and invented partial Transfiguration first, and just never told anyone about it.
Even if he didn’t, the fact remains that Quirrell knows Harry was able to cut through the wall of Azkaban somehow. I wouldn’t be at all surprised if he figured it out purely through deduction.