It's mean to fire someone because they are injured.
Elon's employee Jim injured himself in the factory while using some of the heavy equipment.
Elon has to decide what to do with Jim.
Elon tells Jim that he will help pay for his medical bills until he's ready to come back.
Elon decides to lay off Jim since he can't contribute anymore.
Jim feels grateful for Elon and is glad that they'll have a job once they come back.
Jim has trouble paying off his medical bills and can't find another job.