The Boomer will not vomit as soon as it sees you, waiting approximately 3 seconds before vomiting.Spitter acid deals an average (because damage increases as Survivors remain exposed to it) of 32 damage, and clawing does 1 damage per hit.The Jockey does 3 damage per hit while riding a Survivor and does 1 damage per hit.The Charger deals 5 damage per punch, 10 damage when it finishes a charge while carrying a Survivor, and 15 damage per slam.The Hunter deals 10 damage per claw and 5 damage every half-second to pounced Survivors.The reaction time resets when the Smoker moves or is out of the Survivor's sight for more than 5 seconds. The Smoker deals 10 damage per hit on ensnared Survivors and has a 3 seconds reaction time before attempting to ensnare one.In The Sewer, Survivors can incapacitate or kill themselves by shooting the gas station.As before, Survivor Bots may accidentally hit oxygen and propane tanks and damage themselves.Pipe bombs, oxygen tanks, propane tanks, and Grenade Launchers will not do damage to your teammates, but will do roughly 5 to 30 damage to yourself if detonated too close.In Left 4 Dead 2, this only happens if they are using Explosive Ammo. Note that a Survivor Bot can accidentally hit gas cans, fireworks, Explosive barrels and deal damage to you and the team.Molotovs, gas cans, fireworks, and explosive barrels, once ignited, can still cause damage to you and other Survivors, so watch where you throw or shoot them.The number of friendly fire incidents will also be recorded on a Steam player's statistics on PC. Friendly fire does not inflict damage, but friendly fire incidents will still register and disqualify players from earning the SAFETY FIRST achievement in Left 4 Dead.She does 12 damage to an incapacitated Survivor every half a second (equivalent damage is dealt every 2 seconds on the Xbox 360 version of Left 4 Dead 2). The Witch receives × 2 damage to the body and is startled in 8 seconds.Only one Tank will ever spawn at a time during scenes where normally multiple Tanks can spawn, such as the Finales of Swamp Fever or The Sacrifice (multiple Tanks can still spawn if enforced by console commands or scripted sequences in Custom Campaigns). The Tank has 3000 health points, does 12 damage per hit and 75 when pounding an incapacitated Survivor.This only affects damage dealt by the Common Infected. There is roughly a 1/2-second grace period where the Survivor will not take damage after being inflicted upon.Common Infected receive × 2 damage to the body and deal 1 damage per hit, 0.5 if attacking a Survivor's back.This mode is also useful when specifically trying to earn achievements, as the Infected are less dangerous compared to other difficulties. This mode is recommended for beginners and those who want to try new strategies. The change takes 2 seconds to take effect after the vote passes however, so be wary of the damage output of the Infected if you change from a hard to easier difficulty.Īs the name suggests, this difficulty is the easiest of the four. This only affects the AI's damage and reflex output if a Tank is being fought on Advanced or Expert difficulty and the team changes the difficulty to Easy, it will still retain the 8000 health pool but deal damage that it would deal on Easy difficulty. In Single Player this is automatically done as you are the only human player in that campaign. Like voting in Versus, it requires more than half the votes to pass. You can change the difficulty of a campaign by searching up "Make a vote" and changing the difficulty. The specific differences between each difficulty level are listed below. For example, on Easy difficulty, it's rare to see a Horde outside of the occasional Crescendo Event, whereas on Expert, it's likely you'll face a Horde around every corner. Each level refers to the difficulty of the campaign, and each is drastically different than the others. There are four difficulty levels in Left 4 Dead.