The reason for this is that regenerating about 100 HP per second can be difficult for a guard to kill, making the medic house an easy spot for prisoners to camp and waste time, even if there are multiple guards trying to kill the prisoner.
Most of you already know about this, but for those who don't, you can join the JB server and check it for yourself.
Most of you already know about this, but for those who don't, you can join the JB server and check it for yourself.