Why wont my magnitude script delete the brick when away from it?

I want this script to remove its parent when a player is not near it, but it will not work why?

while true do
    for i,v in pairs(game.Players:GetChildren()) do
        if (v.Character.UpperTorso.Position - script.Parent.Position).magnitude >= 10 then
            script.Parent:remove()
            print("Perfect")
        end
    end
    wait()
end