It would have been good if they could have played the tape to Gillies and asked for comment.
By the looks of it the prof had already seen the video on YouTube or at least read a transcript.
He wasn't asking these questions to gain information - he already had the information and knew tha answer to every question he asked. He just wanted Gillies to say it for himself. He wanted Gillies in a certain spot. Just showing him the video could have given him the option to deny it is an official unaltered video.
Now Gillies has to 'find' the recording of the seminar that the prof already knows exists.
Either Gillies had to come back lying and get caught, or he has to present evidence that JW consider legal proceedings as 'Satan out to get us'.