You shouldn't fire someone after they get surgery.
Kevin is a manager at work, and his employee Zach just had his pancreas removed, so Zach's work is not getting done.
Kevin wants Zach's work to get done.
Kevin hires temporary help to handle Zach's workload until he recovers.
Kevin fires Zach and hires a new employee to take his place.
Zach returns to work and does an excellent job, as before.
The new employee lacks Zach's experience and doesn't fit the position.