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.

So I see one thing that's wrong with this. I don't do guns but I know it's supposed to shoot when the mouse it down not up. Just change line 7 to this.

Mouse.Button1Down

Also, before posting, look on the DevHub then DevForum before coming here. Also, look at this. It has some good information for what you're doing.