Never use any of this information in place of a trusted medical doctor, medical authority, or disease control office.
Nowadays, this trope is even encouraged in real life, due to the fact that most modern armies engage in combat with forces that do not respect the Geneva conventions. Not to be confused with Deadly Doctor, a medical doctor who fights Strax: [cheerfully] Of course you will my boy, you'll be up and around in no time.
And perhaps one day, you and I shall meet on the field of battle, and I will destroy you for the glory of the Sontaran Empire!
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Enemies that try to Shoot the Medic First will find that he won't go down as easy as they expected when he can create impenetrable force fields or just swat them into the stratosphere.
Last but not least, certain tactics can make their harmless powers lethal, like casting revive on enemies when Revive Kills Zombie.
The militant medic isn't unique to video games, either; healers often find it necessary to pick up some combat ability and kick a few asses every now and then if they don't want to be stuck in the background.
After all, in an action series, the Hippocratic Oath is a rather overrated thing, and the Geneva Convention is simply quaint and obsolete.
This is linked to Shaolin Monks knowing Martial arts and the term "monk" often being synonymous with a religious figure.