Doc is a support Operator, and does just as his name implies. Stick close to both the objective and friendly Operators. If they become injured or go into a downed state, get them back up quickly with a single shot. Alternatively, you can give them a boost if their health is already relatively high. Use the temporary additional health boost to attack the remaining enemies without getting killed too quickly.
Doc’s unique ability is the Stim Pistol. This pistol fires a hypodermic shot that can revive and heal friendly Operators and even Doc himself!
This pistol is a single shot and reload “weapon.” A total of three shots are available per round in Multiplayer or five shots in Terrorist Hunt. Press the ability button once to switch to the pistol, then a second time to use the gun on yourself. Using the Stim Pistol as a weapon is simple, as you only need to press the fire button once the gun is out to shoot and heal. This can be done to friendly Operators, the Hostage, and even enemy Operators! Yes, the Stim Pistol can be used to heal and revive enemy Operators.
One shot from the Stim Pistol will add 40 HP to a standing Operator. If the Operator is downed, a shot will revive them with 75 HP. The same goes for Doc, as he can both heal and revive himself with the Stim Pistol.
The Stim shot can also provide a temporary boost if the health gauge goes over 100. The maximum health is 140, but the meter will slowly drop back to 100 after 40 seconds.