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Benefit(s): If you are wearing medium or heavy armor and are adjacent to an ally who also has this feat, as a free action, you may give your ally a circumstance bonus to her AC equal to half the armor bonus provided by your armor. This bonus lasts for 1 round. During this round, you gain no bonus to your AC from your armor.
Can two allies grant this bonus to a third?
Can a single ally grant this bonus to two different allies?
Can two allies grant this bonus to a third?
They could, but the effects wouldn't stack: it's a bonus from the same source, even though it came from two different PCs.
Can a single ally grant this bonus to two different allies?
I doubt it, as the granting ally can only lose their own armour AC once. But there's no explicit rule against it that I'm aware of.
It's not the same source though. They are two separate feats owned by two separate people. Two people can perform aid another actions. What matters is the bonus type, and circumstance bonuses stack.