The Horde's screams are right in time with the chorus that follows. It signals a Horde attack right after the line "But here's an FYI, you're all gonna die screaming.". In Left 4 Dead 2, RE: Your Brains can be played on the jukeboxes found in some of the campaigns.The only way to refuse treatment from them is to pull out a healing item (pills, adrenaline or your own medkit).
The cvar "sb_temp_health_consider_factor 1.0" can be used to rectify this, but a mod is required to implement this without enabling cheats. They adjust their "judgement" a little depending on how much temporary life you have, but not very much note For some incredibly stupid reason, the AI treats temporary health gained by pills and adrenaline shots as being half of that of permanent health, which often results in the AI wasting a health kit if they only have temporary health, rather than savoring that temporary health and using a health kit much later. Not to mention how they persistently try to heal you the second your health drops below 40 (or 30 in The Last Stand update). Even if that means stopping you where you're standing, potentially condemning you, them, or some other teammate to death. They will do their damn best to keep you going, but ignore anything else occurring at the moment.
Five expansive campaigns for co-operative, Versus and Survival game modes.Over 20 new weapons & items headlined by over 10 melee weapons – axe, chainsaw, frying pan, baseball bat – allow you to get up close with the zombies.Next generation co-op action gaming from the makers of Half-Life, Portal, Team Fortress and Counter-Strike.L4D2 promises a satisfying and uniquely challenging experience every time the game is played, custom-fitted to your style of play. This improved Director has the ability to procedurally change the weather you'll fight through and the pathways you'll take, in addition to tailoring the enemy population, effects, and sounds to match your performance. Helping to take L4D's frantic, action-packed gameplay to the next level is AI Director 2.0. You'll also encounter five new uncommon common infected, including the terrifying Mudmen. You'll be putting these weapons to the test against (or playing as in Versus) three horrific and formidable new Special Infected. In addition to firearms, you'll also get a chance to take out some aggression on infected with a variety of carnage-creating melee weapons, from chainsaws to axes and even the deadly frying pan. You'll play as one of four new survivors armed with a wide and devastating array of classic and upgraded weapons. This co-operative action horror FPS takes you and your friends through the cities, swamps and cemeteries of the Deep South, from Savannah to New Orleans across five expansive campaigns. Set in the zombie apocalypse, Left 4 Dead 2 (L4D2) is the highly anticipated sequel to the award-winning Left 4 Dead, the #1 co-op game of 2008.