He couldn't be bothered to walk to a place, where cars could be seen from a nice open space. So he crossed the road right next to a bend. Now his arm, for some while, will be struggling to mend. A car cannot dodge what it cannot see, so flattened the boy unfortunately. Now he can't swim, dress himself or go cart, because his arm is all limp and falling apart.
Always cross when you can see what's coming.