Just after the section where he is hit by the knife, they are standing together; to me his shirt at the back looks odd and I suspect he is wearing some form of body armour. Having been pulled from the audience at Ashton's circus and been blindfolded whilst knives were "thrown" at me I agree with the bravery of the target. I am not brave, my arms and legs were padlocked and a balloon was placed between my legs. The thuds as the knives went in was very real and the kids told me later how much I flinched! They also pointed out that (spoiler alert) all the knives had been sunk into the backboard by the girl standing next to me.