There's no way that anyone can lose control if he or she applied the brakes when going down. Just apply a little force on the brake can save your life. No need for any helmet or anything. You can see that the slope is a long gradient down so don't be hao lian especially when you are old.
ok lah...I admitted I also didn't apply brakes when going down that slope but that was when I was in my teens...

. After that time, subsequently when I grew older, I don't dare to ride that slope again without applying the brakes. Can easily control the bike by applying a little force to the brakes and maneuvre the bike.