Here, the fluoride anion moves along the c direction towards the F@Si1_4 site, but returns more or less immediately to its initial position, with the residence time at the F@Si1_4 site remaining below 1 ps. It might be debatable whether such short-lived displacements from the equilibrium position should be counted as dynamic events at all. However, they were included in the analysis as the present work aims to capture as much of the dynamic behavior as possible.