I do want to clear a few things up
First, the circle I made mid fight was as an example, while you may manage to pull this off in the assessment, almost any other fight will be to the death
if you are supernatural, they WILL be prepared and they will maliciously exploit your weaknesses, that is the reason that supernatural creatures get a second nature.
Second, chances of pulling off a full power spell in a real fight are next to none. The primary use of full power spells are wards, enchantment, healing, and other non-combat magic.
Third and lastly, A circle can have any number of points and runes, the one I used was the simplest possible. The more ornate the circle, the stronger the spell.