https://www.dailymotion.com/video/x8734jq (from 02:10)
In the animation, broken pieces of glass are slightly rotating and falling down reflecting prism-like lights. I thought maybe it was added later manually, but this is not a static image and the prism reflections also move with the glasses. It would have been a lot of work to add such reflections to an animation. I wonder how this kind of effect was created.