If you are a jockey or a smoker, and you're pinning someone, press and hold crouch to prevent any other infected from stealing your pin. This effect is achieved by temporarily making the game think the survivor is also pinned by a hunter, and no one can steal a pin from a hunter.
There are two "glitches" to this. As the jockey, when protecting your pin you will be unable to move. As the smoker, protecting an incapacitated victim will cause the survivor to die more slowly (5 dps instead of 17dps)
CVARS
l4d2_pinprot_enable (default 3):
--Enable bit flag (add together)
--1=Jockeys can protect pins, 2=Smokers can protect pins
UPDATES
V1.1
- Fixed invalid attacker bug
v1.0
- Fixed bug if bot replaced player or player replaced bot while a pin was being protected
- Added enable flag so that infected classes can have protection enabled individually