Microsoft is testing animating the Bing "people also search for" boxes. Bing will run this animated outline around the boxes when it loads, to give it more attention to the searcher.
This was spotted by Khushal Bherwani who wrote on X, "Bing is testing a new laser-style animation around the “People also search for” refinements section — looks quite impressive."
Here is a GIF of what it looks like:
It is hard to replicate but here is his full video:
