I've been going back and forth with this because camera angles can be deceiving.

I found an article, that if you scroll up and down the left side of the page, it will point out where all the notable people were sitting/standing during, what I can only assume, is the swearing in portion of the inauguration. The picture is of Biden with his hand up and Pelosi is at least 20ft behind Biden and turtle Bitch is a few feet in front of her. Both nowhere near standing behind Biden.

https://www.washingtonpost.com/politics/interactive/2021/photos-attendees-biden-inauguration/

I found a video of the swearing in ceremony and it shows Pelosi directly behind Jill and turtle Bitch a handful of feet behind Biden. They are both closely behind Biden from the time he raises his hand to the time he lowers it. The entire portion of the swearing in ceremony with his hand held up was approximately 33 seconds.

I didn't watch the inauguration, was there another time at which he has his left hand raised and right hand on his bible? That, in my opinion, would be the only explanation of this.

https://www.cnn.com/videos/politics/2021/01/20/joe-biden-swearing-in-president-inauguration-vpx.cnn