It has an unexpected incident that is has many bricks are falling down, put his head.It may cause injury, or he has to lose a life.Because he has not been clear, helmet.
At the scene, it was more unexpected. That is a lot of bricks are falling down, put his head it could cause him serious injury or death up to because he was not wearing a helmet.
At the time due to unforeseen circumstances. There is a lot of bricks falling on his head.It may make him seriously injured or to the death.Because he didn"t clear safety helmet.