Make my script only deal damage when keycode C is clicked?

Hello! Im trying to make a dropkick script, ive already got everything set except i encountered one major problem. My intention was to have the player deal damage to an enemy when they click the keycode C but the players legs constantly deal damage, i dont know what to do please help

--Made By 123Marooxd123
local lleg = script.Parent:FindFirstChild("Left Leg")
local rleg = script.Parent:FindFirstChild("Right Leg")

local UIS = game:GetService("UserInputService")
local character = script.Parent
local humanoid = character:WaitForChild("Humanoid")
local DropAnim= Instance.new("Animation")
DropAnim.AnimationId = "rbxassetid://9642052968"

local dmg = false
local CanDropkick = false
local Keybind = Enum.KeyCode.E
local LeftLeg = game.Players.LocalPlayer.Character["Left Leg"]
local RightLeg = game.Players.LocalPlayer.Character["Right Leg"]

local topspeed = 25
character.Humanoid.Running:Connect(function(speed)
	if speed > topspeed then
		CanDropkick = true
		dmg = true
	else if speed < topspeed then
			CanDropkick = false
			dmg = false
		end
	end
end)



function dmg(hit) --- this is the function that lets the player deal damage with their legs
	if hit.Parent ~= nil then
		local hum = hit.Parent:findFirstChild("Humanoid")
		if hum ~= nil then
			hum.Health = hum.Health -10
		end
	end
end

lleg.Touched:connect(dmg)
rleg.Touched:connect(dmg)

UIS.InputBegan:Connect(function(input,gameprocessed)
	if gameprocessed then return end
	if not CanDropkick then return end
	if not dmg then return end
	if input.KeyCode == Keybind then
		CanDropkick = false
		dmg = false
		
		
		
		
		
		local playAnim = character.Humanoid:LoadAnimation(DropAnim)

		playAnim:Play()
	local drop = Instance.new("BodyVelocity")
	drop.MaxForce = Vector3.new (1,0,1) *30000
	drop.Velocity = character.HumanoidRootPart.CFrame.lookVector * 85
	drop.Parent = character.HumanoidRootPart

		for count = 1, 8 do
	wait(0.13)
	drop.Velocity*= 0.5
		end
		
	playAnim:Stop()
	drop:Destroy()
		CanDropkick = true
		dmg = true
		end
	end)