This is the Boomer


The Boomer is a Special Infected that vomits a special bile at Survivors, which temporarily blinds them and draws a Horde of Common Infected to them. At a distance the Boomer isn't much of a threat; their large size and low health make them an easy target against any weapon at mid or long range. However, if within range, they can vomit on Survivors, attracting the Horde.
When they die, they explode, covering any Survivors who are close enough with bile, blinding them and causing them to stumble backward. The Boomer is notorious on the Expert difficulty for being able to snipe Survivors. Boomers can be anticipated because of the near-constant gurgling they make. In Left 4 Dead 2, there is also a female Boomer, although the gender has no effect on gameplay.
His looks change a bit in the second game
Then there's the female Boomer
She only occurs in the second game
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Explaining LF4D/LF4D2 (Left4Dead/Left4Dead2)
Randomthis is about the survival zombie game for my friend Neko to help him out! :) and you guys if u don't know about it I guess