best example is the well known Gaunt shield or the Gretchin shield:
though the Tyra Zoa is "covered" by gauts its "viewing" point is so high any target it fires on will never get cover from the gaunts
actually, the zoanthrope's target gets a cover save too. the "view", or true los rule only applies to MC's and vehicles. any infantry model simply counts anything between them and their target as an intervening unit and therefore grants a 4+ cover save. The rules on cover in 5th edition are "deliberately generous," to quote the BRB, and swarms are still intervening models.
EDIT: didn't see 2nd page, sorry
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Last edited by Logyn; 10-23-09 at 04:40 PM.