Why does this script not work after i wait a little after the 2nd animation plays?

If i keep pressing E, then it work's perfectly. But if i press E twice and wait a little, it won't play the other animation, or just prints('2'), and nothing after. Any ideas on why this is happening?

wait(game.Lighting.TimeToLoad.Value)

local UIS = game:GetService("UserInputService")
chain = 0

--//Combat Animation
local combat1 = Instance.new("Animation")
combat1.AnimationId = "http://www.roblox.com/Asset?ID=1093151226"
--
local combat2 = Instance.new("Animation")
combat2.AnimationId = "http://www.roblox.com/Asset?ID=1093152736"
--
local combat3 = Instance.new("Animation")
combat3.AnimationId = "http://www.roblox.com/Asset?ID=1093155314"
--
local combat4 = Instance.new("Animation")
combat4.AnimationId = "http://www.roblox.com/Asset?ID=1093156822"
--
local combat5 = Instance.new("Animation")
combat5.AnimationId = "http://www.roblox.com/Asset?ID=1093157747"
--
local combat6 = Instance.new("Animation")
combat6.AnimationId = "http://www.roblox.com/Asset?ID=1093158550"

UIS.InputBegan:Connect(function(Input, gameProcessedEvent)
    local KeyCode = Input.KeyCode
    if gameProcessedEvent == false then

    if KeyCode == Enum.KeyCode.E and chain == 0 then
        chain = 1
        print('1')
        local animTrack = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(combat1)
animTrack:Play()
workspace.CurrentCamera.Sounds.P1:Play()
wait(.5)
chain = 2
    else
    if KeyCode == Enum.KeyCode.E and chain == 2 then
        chain = 3
        print('2')
        local animTrack2 = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(combat2)
animTrack2:Play()
workspace.CurrentCamera.Sounds.P1:Play()
wait(.5)
chain = 4
    else
    if KeyCode == Enum.KeyCode.E and chain == 3 then
        chain = 4
        print('3')
        local animTrack3 = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(combat3)
animTrack3:Play()
workspace.CurrentCamera.Sounds.P1:Play()
wait(.5)
chain = 5
    else
    if KeyCode == Enum.KeyCode.E and chain == 5 then
        chain = 6
        print('4')
        local animTrack4 = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(combat4)
animTrack4:Play()
workspace.CurrentCamera.Sounds.P1:Play()
wait(.5)
chain = 7
    else
    if KeyCode == Enum.KeyCode.E and chain == 7 then
        chain = 8
        print('5')
        local animTrack5 = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(combat5)
animTrack5:Play()
workspace.CurrentCamera.Sounds.P1:Play()
wait(.5)
chain = 9
    else
    if KeyCode == Enum.KeyCode.E and chain == 9 then
        chain = 10
        print('6')
        local animTrack6 = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(combat6)
animTrack6:Play()
workspace.CurrentCamera.Sounds.P1:Play()
wait(.5)
chain = 0
        print('reset')
    end
    end
    end
    end
    end
    end
    end
end)