If you look at the video from 4:00 - 4:24, he goes silent right after the essential form, looking puzzled, and he takes the book over to the altar and bends over, possibly for a better view under better lighting, examining the book for a long time, appearing a bit confused. Looks like a booklet was on top of the main Ritual, or he was using an alternative edition, possibly a larger-print version, due to the obvious struggle with vision / eyesight. I suspect that he was re-examining it because he knew he messed it up and then could very well have attempted it again. But the video was "edited" to "protect identities". And, if that wasn't the case, do we know that someone else didn't catch the error in the video and that he didn't "fix" the problem later? Unlike Bishop Pfeiffer, Bishop Slupski appears to be a humble man and wouldn't refuse due to his ego.
Produce a link to the entire video.