Answer:
Short answer: they can't be stopped
Explanation:
If you are speaking about reality, they have already been stopped by a natural factor, so there is no need to fear them XD
But if you are talking movie style, just a quick pop to the head will (and should, if not, you are in some deep trouble) do the job, but if there are too many, then you may want to hole up somewhere and leave them bad boys alone. :)
