If it is their wands that cannot interact, that means that they can use wandless magic on one another. I don’t remember if it was ever stated in the story that Quirrell cannot do wandless magic on Harry, but if he can that gives him a very big advantage when it finally comes down to a showdown between them.
If it is their wands that cannot interact, that means that they can use wandless magic on one another. I don’t remember if it was ever stated in the story that Quirrell cannot do wandless magic on Harry, but if he can that gives him a very big advantage when it finally comes down to a showdown between them.