What Does This Answer Mean?
as it is called a unique event, it is only tracked once/ per IP.
but sessions can be counted multiple times. (in this case 3)
whether it’s a video or a page, sessions are all, unique is only one person that the IP will be locked as a Cookie.
then even if he returns to see the video again with the same browser and IP or ISP it will be counted as a single unique event.