What's wrong with this script?

The ball is created, and it stays in front of me. It doesn't move forward like it should. It decides to stop working after about 2 shots. Sometimes one.

Player = game.Players.LocalPlayer
Char = Player.Character
Torso = Char.Torso
Mouse = Player:GetMouse()
Attack = false
function onKeyDown(key)
    key = key:lower()
    if key == "f" and Attack ==  false then
        Attack = true
        local Ball = Instance.new("Part")
        Ball.Parent = workspace
        Ball.Shape = "Ball"
        Ball.Size = Vector3.new(5,5,5)
        Ball.BrickColor = BrickColor.new("Really red")
        Ball.Transparency = 0.4
        Ball.TopSurface = 0
        Ball.BottomSurface = 0
        Ball.CFrame = Torso.CFrame * CFrame.new(0,0.5,-4)
        local Bv = Instance.new("BodyVelocity")
        Bv.Parent = Ball
        Bv.maxForce = Vector3.new(math.huge,math.huge,math.huge)
        Bv.P = 1250 
        Bv.velocity = Torso.CFrame.lookVector * 1000
        game.Debris:AddItem(Ball,4)
        wait(3)
        Attack = false
    end
end
Mouse.KeyDown:connect(onKeyDown)