advanced fireball local script

local control = script.Parent -- gui
local mouse = game:GetService("Players").LocalPlayer:GetMouse() -- mouse
local remote = control:WaitForChild("DAMNFIRE") -- remote event
local uis = game:GetService("UserInputService") -- input service (detect key pressed)
local holding = false

uis.InputBegan:Connect(function(i,x) -- uis keypressed function
    if not x then -- check if player is not typing in chat or in a gui
        if i.KeyCode == Enum.KeyCode.F then -- check if the player has pressed the button
            holding = true
            remote:FireServer("START")

            while true do
                if holding then
                    remote:FireServer("HOLDING")
                else
                    break
                end

                task.wait()
            end
        end
    end
end)

uis.InputEnded:Connect(function(i,x)
    if not x then
        if i.KeyCode == Enum.KeyCode.F then
            task.wait(.1)
            holding = false
            remote:FireServer("FIRE",mouse.Hit.Position)
            print("released")
        end
    end
end)