I am creating a punching script, the damage script isn't working the way I want it?

GOAL: PUNCHING SCRIPT ONKEYPRESS - R ANIMATION ACTIVATES THEN DOES DAMAGE (ONLY ON ACTIVATION)

So this damage script is supposed to do damage on activation (onKeyPress) not when it hits direct humanoid.

This damage script is entirely seperate from the main punching script, I will now explain,

PROBLEM:

For example:

If I touch a humanoid while that punching (local) script is in the backpack, it takes damage, it is supposed to do damage on the KeyPress activation, and I don't know any other way..

THE DAMAGE IS A REGULAR SCRIPT, THE PUNCHING SCRIPT IS A LOCAL SCRIPT.

Damage Script:

Player = game.Players:GetPlayerFromCharacter(script.Parent.Parent)

local char = Player.Character
local torso = char:findFirstChild("Torso")
local rightarm = char:findFirstChild("Right Arm")

function onDamage(rightarm)
    if rightarm.Parent:FindFirstChild("Humanoid") ~= nil and rightarm.Parent.Name ~= script.Parent.Name then
        for i = 1,6 do -- change this to change damage
            rightarm.Parent.Humanoid.Health = rightarm.Parent.Humanoid.Health - 0.8
            CanCollide = false
            wait(0.0001)
        end
    end
    wait(0.025)
end

rightarm.Touched:connect(onDamage)

The punching localscript is a script that activates an animation and gives XP while cloning the damage script to do damage:

local UserInputService = game:GetService("UserInputService")
Player = game.Players.LocalPlayer
mouse = Player:GetMouse()

repeat wait() until Player.Character

local char = Player.Character
local torso = char:findFirstChild("Torso")
local leftarm = char:findFirstChild("Left Arm")
local rightarm = char:findFirstChild("Right Arm")

enabled = true

HoldVariable = 0

local function onInputBegan(input,gameProcessed)
    if input.KeyCode == Enum.KeyCode.R and HoldVariable == 0 then
        HoldVariable = 1
        if leftarm or rightarm.BrickColor == BrickColor.new('Really black') then
        local hum = game.Players.LocalPlayer.Character.Humanoid
        local anim_feet = hum:LoadAnimation(script.Parent.PunchAnim)
        local current = anim_feet
        current:Play()
        local fd = script.Parent.PunchDamage:clone()
        fd.Parent = rightarm
        Player.Data.Xp.Value = Player.Data.Xp.Value + 460
        fd.Disabled = false
        wait(0.7)
        end
        wait(0.2)
        HoldVariable = 0
    end
end

UserInputService.InputBegan:connect(onInputBegan)