Those comments were made because it's an indication that there's something not right going on here, with the subject of the video. Initial judgment being what it is - "Dang! That guy didn't even flich when that thing went off in front of him! There may be a reason for that!" Directly into the vid after that, they light him up with non-lethal, and he has very, very little reaction to that stuff.
So, those reasons are why those comments were made. Those methods usually have a positive impact on the subject, and are ways to gain compliance in a non-compliant person. Usually.