Baffling Moving Light In The Sky During Sunset

This weird light has been captured recently in the skies above Indiana. It looks a bit like a spotlight shining from a stationary position in a certain pattern of movement, which is obviously impossible, as it is in the sky. This is a very rare event. What could it be? A UFO?

There is a hypothesis that it could have been caused by lightning discharge, which would change the electric field just above the cloud, with charged ice crystals reflecting the sunlight. This new electric field is then said to quickly re-orient the crystals, causing it to reflect the sunlight in a different way. Sounds like a plausible explanation, what do you think?