If the opening on the floor above was big enough to lower an alarm clock down, he can get some lengths of 1/2 inch all tread and couplings. Drop one down, put a coupling on and repeat till it reaches the clock. Then spear it!. if you don't grab it you will at least kill it.
My thought is he has a much smarter kid who keeps pulling it up and changing the battery every 6 months or so.