Active Air Mine (能動 空中 機雷) is a spell specifically made for the Newcomers Speed Shooting event that Shizuku participated in. It enables the user to tag all solids that enter the Magic Activation Zone with magic vibratory waves, destroying the targets. By generating compression waves inside the target, it undergoes repeated partial expansion and contraction. The rapid heating and cooling is repeated and hence, even solid rock weakens and collapses. However, Watanabe Mari instantly seen the tactical potential the magic may have. If controlled properly, it could serve as an active shield.