Friendly fire
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— The Scout after being shot by a teammate
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Friendly fire is the instance where a player can damage, or even kill, an ally on the same team.
The ability to inflict friendly damage was an option available to servers during the Team Fortress 2 Beta. This made setting up an ÜberCharge quicker and also benefited Spies as it discouraged Spy-checking. Valve removed the feature upon release as it was known to cause errors within the game's code, as well as harbor potential for griefing. The low focus on accurate shooting in the game also meant that friendly fire could become an impediment if several classes attempted to co-operate with one another.
Full friendly fire is still available as a server option but is rarely used in standard play. On such servers, it is impossible to damage friendly buildings or backstab teammates. Lighting your team on fire is also mostly impossible, with the exception of the Flare Gun after certain distances. "Jar-Based" weapons such as Jarate and Mad Milk also have no effect on teammates. It is also possible to dominate, and logically get revenge on, your teammates.
On some servers, friendly fire is temporarily enabled while waiting for enough players to join for the round to start.
Forms of Friendly Fire
If a Medic is healing an enemy Spy that backstabs a teammate, the Medic will receive an assist as if he were on the team of the Spy. This can be considered a form of friendly fire. Also, triggering a pumpkin bomb with a Huntsman arrow, Jarate or Mad Milk will damage or even kill teammates if they are nearby.
Sentry Guns are capable of killing their own Engineer during normal play. This can be achieved through the use of a Wrangler or the Engineer deliberately (or accidentally) standing in the gun's path. Tricking Sentry Guns to do this is a viable tactic for a Scout using Bonk! Atomic Punch or a cloaked Spy.
