Horseplay can be extremely dangerous and life threatening either at home or at workplace. Hope, he is alright!
Catching silica dust can not get any simpler than this:) When workers cut, grind, drill, or crush materials that contain crystalline silica, very small dust particles are created. These tiny particles (known as “respirable” particles) can travel deep into workers’ lungs and cause silicosis, an incurable and sometimes deadly lung disease. Employers must take steps to protect workers from exposure to respirable crystalline silica.
The construction industry has the worst reputation of unsafe ladder use and for that matter it is one of the most persistent hazards both in the workplace as well as at home. Falls from ladders are also one of the most common causes of fall-related injuries and fatalities.