How to stop a script from damaging the Humanoid when spamming E?

I don't know how to explain in such few words, but basically what my script does is that whenever the player presses E and a humanoid is touching the Handle of the tool, it damages him, the problem is that you can just spam E and damage the Humanoid alot while still in the attack animation, does anyone know how to fix it?

--\ The Script //--

--\\ VARIABLES //--
local UserInputService = game:GetService("UserInputService")
local player = game.Players.LocalPlayer or game.Players.PlayerAdded:Wait()
local swing = Enum.KeyCode.E
local spin = Enum.KeyCode.Q
local damage = 0

--\\ SWING //--

function swing(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.E then
		damage = 15
		script.Parent.Touched:Connect(function(part)
			wait(.7)
			if part.Parent:WaitForChild("Humanoid") then
				part.Parent.Humanoid:TakeDamage(damage)
				damage = 0
			end
		end)
	end
	end

UserInputService.InputBegan:Connect(swing)

Any help?

So, what you need to do is add a debounce to your script. You seemingly did add a variable named debounce, but perhaps you forgot to actually code the debounce in? This code should be working:

--\\ VARIABLES //--
local UserInputService = game:GetService("UserInputService")
local player = game.Players.LocalPlayer or game.Players.PlayerAdded:Wait()
local swing = Enum.KeyCode.E
local spin = Enum.KeyCode.Q
local damage = 0
local debounce = false

--\\ SWING //--
function swing(inputObject, gameProcessedEvent)
	if debounce == false then
		debounce = true
		if inputObject.KeyCode == Enum.KeyCode.E then
			damage = 15
			script.Parent.Touched:Connect(function(part)
				wait(.7)
				if part.Parent:WaitForChild("Humanoid") then
					part.Parent.Humanoid:TakeDamage(damage)
					damage = 0
				end
			end)
		end 
	end
	debounce = false
end

UserInputService.InputBegan:Connect(swing)

If you want to read about debounces and when to use them, check out this article. https://developer.roblox.com/en-us/articles/Debounce