Looks like an off day. From what I have seen, that isn’t his normal riding style. While I agree that temper has no place on the horse, I have to admit that we are all guilty of letting our anger show on horseback, I certainly am. I am not proud of it in any way, but it’s happened.
Who knows what this horse does normally anyway. Maybe he was taking off in the warm-up? Generally a reaction like this doesn’t just happen out of the blue.
Here are some other videos.
https://www.youtube.com/watch?v=esVJbZ1H8FU
https://www.youtube.com/watch?v=GTc9IWgwe7E