I think its actually kind of cute, it may look alarming but I think the guy has a good handle on the situation and maybe he didn't expect quite such a strong reaction. I agree that the other horses don't help the situation but may their dirty looks did, did you see the expression of that chestnut horse? He was like what the heck are you doing? Im outta here! When you have seen more than one youngster getting its first opportunity to try and buck off his saddle you realize how common it is and how it doesn't last long. By doing it this way the horse starts to think anything you put on its back can't be bucked off but also isn't going to hurt them. This will hopefully trick them into thinking the same about you.
Troubled TB ~"A thorn by any other name will prick just as deep." @-'--,---