Safari Picture in Picture playing, how do I choose the video to PiP with two feeds?

I watch a lecture online that has 2 simultaneous videos playing (panopto) the lecturer irl and the feed of the slideshow. How do i get safari picture in picture to select the correct video to PiP it? If I pause one video the other video pauses as well. It keeps PiP the lecturer feed, but I would like the slideshow feed to be PiP.