If the base is far away it is a risk to go kill him.
Your rat trap must be designed to function without you babysitting it. More difficult now that we have thieves and golems, but not impossible.
The summoned meteors work like any other in game meteors. They come streaming down, inflicting massive structural and personal damage until they hit the mesh. Once they hit permanent/non destructible terrain, they stop and wait for you to harvest them.
That having been said, many of the locations that would offer this sort of protection also will fail to spawn a purge because cowardice is a greater virtue than greed amongst the minions of Ctesphon.
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