For some reason the mismatched usage of 'corner' really bothers me! I'm sorry for this pointless comment.
I was about to saw the same thing. That phrase must be so confusing for maga if he always pictures an interior corner instead of an exterior one.
I'm sorry my humble attempt at wordplay mixing the corners bothers you, guys. You are right though, corners are not my forté: failed descriptive geometry back in engineering school.
Don't worry about it! I'm sure that from now on you'll avoid falling into this particular corner case of wordplay...