Bosses in Left 4 Dead 2: The Spitter
Spitters can decimate an entire party of Survivors, due in large to their ability to ‘spit’ a highly corrosive ball of acid which can cover large areas of the map. This acid deals large amounts of damage very quickly and so Survivors should always be aware and seek to avoid contact with the acid wherever possible.
Because the Spitter ‘bomb’ is a projectile, it can be launched from distance and so it is often the case that Survivors won’t be alert to the Spitter’s presence until a globule of acid has been launched. Listen carefully, however, as Spitters emit a faint squealing noise making them difficult to hear but a more volumous hacking sound when spitting. They often leave a short trail of acid in their wake as they move.
When a Spitter launches a globule, it will smash on impact, spreading its payload around the area. The acid deals large amounts of damage, and continues to deal damage even if a survivor tries to jump out of the pool, or runs through it. However, getting onto higher ground – tables, dumpsters etc – can often minimise or negate exposure to the pool. Spitter goo, although, it deals a lot of damage to survivors has a limited duration and evaporates after a short time.
For a few seconds after launching a globule, Spitters move more slowly than before, making them an easier target to kill. They often appear with and work well with Jockeys, in that a Jockey can attempt to steer ridden Survivors into a pool of spitter goo.
Once a Spitter has fired off a globule it will often attempt to close up to the Survivors in order to use its claw attack. As with Boomers, shooting a Spitter at close range causes it to explode, showering acid around the immediate area as if the Spitter had launched a globule. They can be meleed/shoved back to a safe distance in order to avoid the spread of acid however.
Note about Left 4 Dead 2 Special Infected
None of these special infected zombies are distracted by high frequency noise, such as car alarms or pipe-bomb countdown. They are, however, affected by fire and explosions from molotovs, pipe-bombs, propane cylinders and other similar projectile weapons and makeshift bombs.