CreateConVar( "gc_realheadcrabs", 1, SERVER_CAN_EXECUTE, "Headcrabs have a chance to kill you instantly." )

function HeadcrabDeath(ply,headcrab)
ply:ConCommand("pp_mat_overlay halflife/black") 
ply:ConCommand("play npc/headcrab_poison/ph_poisonbite1.wav") 
headcrab:Remove()
timer.Simple(1,function() if(ply:IsValid()) then ply:ConCommand("pp_mat_overlay [[]]") end end )
end

hook.Add( "PlayerHurt", "HeadcrabHurtFunction", function( victim, attacker, healthRemaining, damageTaken )
if((GetConVarNumber( "gc_realheadcrabs" ) != 0) || forcerealisticheadcrabs) then

	if(attacker:GetClass() == "npc_headcrab_fast") then
		if((damageTaken + 25) >= healthRemaining) then
			HeadcrabDeath(victim,attacker)
		end			
		victim:SetHealth(healthRemaining - 25)
	end
	
	if(attacker:GetClass() == "npc_headcrab") then
		if((damageTaken + 40) >= healthRemaining) then
			HeadcrabDeath(victim,attacker)
		end			
		victim:SetHealth(healthRemaining - 40)
	end
	
	if(attacker:GetClass() == "npc_headcrab_black") then
		HeadcrabDeath(victim,attacker)		
		victim:SetHealth(0)
	end
	
	if(attacker:GetClass() == "npc_headcrab_poison") then
		HeadcrabDeath(victim,attacker)		
		victim:SetHealth(0)
	end
end
end)