Replying to Injuries on the job

One of our workers broke his ankle today on the jobsite literally minutes before he was supposed to leave. His original story was he was carrying something and tripped on the ground or a piece of rebar and fell on his leg/ankle funny. The story that later came out is he was horsing around and fell over (basically his fault). So not only did he break his ankle and can't work, but now his workers comp claims will be denied so he'll not only be broken but broke too. Kinda sucks for the guy but workers comp is such a drain on a company especially for stupid shit like that. Fun story