Jackson Shutter
A flag on a spinning thing that stops a beam from turning your tiny, fragile targets into smoldering ash.
The Jackson Shutter was like the mom of the target, stepping in before the beam could do anything embarrassing.
The beam was like a bully, and the Jackson Shutter was the principal who finally gave it a detention.
The target was about to cry, but the Jackson Shutter showed up with a snack and a pep talk.