@beardalaxy
Well....
Yes
It does turn Hermione, Harry and Ron into the most selfish/stupid people on the planet.

Ok, time paradox. I get it.
But even without any hard time-bending, can you immagine just using it in battle?

Shoot from one corner, Travel tim, shoot from 2nd corner, travel tim, shoot 3rd time, Not even the lord of darkness could have expected that one.