Free After Execution (フリー・アフター・エグゼキューション) is abbreviated as FAE, is not a magic but a theory describing one peculiarity of the interaction between magic and the physical world. As it is explained by Shiba Tatsuya in Visitor Arc, Chapter 13, there is a tiny time-gap between the end of a magic effect changing reality and laws of physics retaking control of reality. However, if someone manages to exploit this loophole, it is possible to achieve otherwise hardly achievable results. Later Tatsuya developed a new magic called Baryon Lance which also exploits the possibilities of the theory.