I'm sorry, DracoSuave, but your argument indeed makes no sense whatsoever to me as it pertains to the question at hand, i.e. whether a swarm can be "grabbed" or not.
It's not a question of "narrative", but a question of logic, to me. It is a question of whether as a GM you can make judgment calls on your own, or rely on the game system and the DDI updates to answer them all for you. Whether your game is about the Worlds of Your Imagination, or WotC's. And if by talking about a "narrative arc" for 4e you mean that words do not have meaning anymore, that the characters of this game are so far removed from common sense as to only make any in the context of the game rules, and the game rules only, with the make-believe being a consequence of the game system, and not the other way around, then by all means, I reject 4e's "narrative" reality and substitute my own.