Why is the animation not firing?

Please help, I commented in the part of the script with the animation in it.

Parent = script.Parent
enabled = false
-- Variables

Parent.Touched:connect(function(hit)
	player = game.Players:GetPlayerFromCharacter(hit.Parent)
	wait()
	if not enabled and hit.Parent ~= nil then
		enabled = true
		if not player and hit ~= nil and (hit.Parent.Name ~= "Zombie") then
			if hit.Parent:FindFirstChild("Humanoid") then
				hit.Parent:WaitForChild("Humanoid").Health = hit.Parent:WaitForChild("Humanoid").Health - 20
				local AnimController = Instance.new("AnimationController") 
				AnimController.Parent = script.Parent.Parent
				local animation = Instance.new("Animation")
				animation.AnimationId = "http://www.roblox.com/asset?ID=298235328"
				animation.Parent = script.Parent.Parent.Humanoid
				local animTrack = AnimController:LoadAnimation(animation)
				animTrack:Play() -- play anime
				wait(0.5)
				animTrack:Stop() -- stop anime(because this one is looped)
			end
		elseif player and player.TeamColor ~= BrickColor.new("Black") then
				if hit.Parent:FindFirstChild("Humanoid") then
				hit.Parent:WaitForChild("Humanoid").Health = hit.Parent:WaitForChild("Humanoid").Health - 20
				local AnimController = Instance.new("AnimationController")
				AnimController.Parent = script.Parent.Parent
				local animation = Instance.new("Animation")
				animation.AnimationId = "http://www.roblox.com/asset?ID=298235328"
				animation.Parent = script.Parent.Parent.Humanoid
				local animTrack = AnimController:LoadAnimation(animation)
				animTrack:Play() -- play anime
				wait(0.5)
				animTrack:Stop() -- stop anime(because this one is looped)
			end
		end
	end
	wait(3)
	enabled = false
end)Parent = script.Parent
enabled = false
-- Variables

Parent.Touched:connect(function(hit)
	player = game.Players:GetPlayerFromCharacter(hit.Parent)
	wait()
	if not enabled and hit.Parent ~= nil then
		enabled = true
		if not player and hit ~= nil and (hit.Parent.Name ~= "LMADer") and (hit.Parent.Name ~= "BC") and (hit.Parent.Name ~= "SuicideBomber") and (hit.Parent.Name ~= "FastRobloxian") and (hit.Parent.Name ~= "KorbloxianKnight") and (hit.Parent.Name ~= "OBC") and (hit.Parent.Name ~= "ODer") and (hit.Parent.Name ~= "RobloxianR") and (hit.Parent.Name ~= "TBC") and (hit.Parent.Name ~= "Traitor") and (hit.Parent.Name ~= " Zombie") and (hit.Parent.Name ~= "Zombie ") and (hit.Parent.Name ~= "Zombie") and hit.Parent:findFirstChild("Humanoid") ~= nil and hit.Parent:findFirstChild("Humanoid").Health > 0 then
			if hit.Parent:FindFirstChild("Humanoid") then
				hit.Parent:WaitForChild("Humanoid").Health = hit.Parent:WaitForChild("Humanoid").Health - 20
				local AnimController = Instance.new("AnimationController") -- Need help here
				AnimController.Parent = script.Parent.Parent -- Need help here
				local animation = Instance.new("Animation") -- Need help here
				animation.AnimationId = "http://www.roblox.com/asset?ID=298235328" -- Need help here
				animation.Parent = script.Parent.Parent.Humanoid -- Need help here
				local animTrack = AnimController:LoadAnimation(animation) -- Need help here
				animTrack:Play() -- play anime
				wait(0.5) -- Need help here
				animTrack:Stop() -- stop anime(because this one is looped) -- Need help here
			end
		elseif player and player.TeamColor ~= BrickColor.new("Black") then
				if hit.Parent:FindFirstChild("Humanoid") then
				hit.Parent:WaitForChild("Humanoid").Health = hit.Parent:WaitForChild("Humanoid").Health - 20
				local AnimController = Instance.new("AnimationController") -- Need help here
				AnimController.Parent = script.Parent.Parent -- Need help here
				local animation = Instance.new("Animation") -- Need help here
				animation.AnimationId = "http://www.roblox.com/asset?ID=298235328" -- Need help here
				animation.Parent = script.Parent.Parent.Humanoid -- Need help here
				local animTrack = AnimController:LoadAnimation(animation) -- Need help here
				animTrack:Play() -- play anime
				wait(0.5) -- Need help here
				animTrack:Stop() -- stop anime(because this one is looped) -- Need help here
			end
		end
	end
	wait(3)
	enabled = false
end)

Please note that I do have a working humanoidrootpart present in the model. Also, there is another animation(walking) that is playing, how can I cancel out that animation and fire this one instead?