Tool shooting when I'm not holding it, why is it shooting even with an Equipped function?

Here's my script I was trying to get it to only shoot when I hold it out but it continues to shoot anyways

local Part = game.ReplicatedStorage.Fireball
local Tool = script.Parent
local Players = game:GetService("Players")
local Player = Players.LocalPlayer
local Mouse = Player:GetMouse()
script.Parent.Equipped:Connect(function()
    Mouse.Button1Up:Connect(function()
            local partclone = Part:Clone()
            local PlayerPos = Player.Character.HumanoidRootPart.Position
            partclone.CFrame = Tool.Handle.CFrame
            local Vel = Instance.new("BodyVelocity",partclone)
            Vel.P = Vector3.new(100000,100000,100000)
            Vel.Velocity = Mouse.Hit.LookVector * 100
            partclone.Parent = game.Workspace
        end)
    end)

If you know a fix, send it please.