DescentBB

Here is the video sequence of the latest Starlink launch I found interesting. At about T+ 5:10 (20m30s of the video) a circular cloud like formation is developed in direction next to left grid fin and then the video switches to the tank camera for a while which having no action or relevance at this stage.
http://youtube.com/watch?v=4_ePBpwMhns&t=2025s