gettyimages.com has several photos of others with the King but Bambi is the only one bowing to him. The others might be slightly bowing but Bambi is so low, he could retie the King’s shoes if he wanted to.
I’m looking for video of this event.
Click on the website link at the top of this article. Scroll down the page and you will see the complete video. Obama did very clearly bow to him. It should be noted that no one else was seen bowing to the Saudi King.