How can I make throw able knife do damage?

I was following a tutorial on how to make a throw able knife but when i throw it It does not do damage please help me.

local tool = script.Parent
local anim = tool:WaitForChild("KnifeThrowAnimation")
local player = game.Players.LocalPlayer
local mouse = player:GetMouse()
local knifeThrow = game.ReplicatedStorage.KnifeThrow

local cooldown = 2
local debounce = false


tool.Activated:Connect(function()
    if player.Character then
        local humanoid = player.Character:FindFirstChild("Humanoid")

        if humanoid then
            if debounce then return end
            debounce = true

            local charge = 1

            local loadedAnim = humanoid:LoadAnimation(anim)
            loadedAnim:Play()

            loadedAnim:GetMarkerReachedSignal("Charge"):Connect(function(chargeParam)
                charge = chargeParam
            end)    


            local connection = loadedAnim:GetMarkerReachedSignal("PauseAnimation"):Connect(function()
                loadedAnim:AdjustSpeed(0)
            end)


            tool.Deactivated:Wait()

            loadedAnim:AdjustSpeed(-10)
            connection:Disconnect()

            knifeThrow:FireServer(mouse.Hit, tool.Handle.Position, charge)

            wait(cooldown)
            debounce = false
        end
    end
end)