True, it's not phrased that way--which I think is a problem with the phrasing, not the mechanics--but it's the only reading that really makes sense. Few if any PC powers are about
forcing your allies to do stuff; they're all about
allowing your allies to do stuff.
Huh? Archer's Glory doesn't do anything to or about allies. You kill an enemy, you use the power, you get an action point, you have to spend it - no allies involved.
Plus, that reading doesn't require a break in the 1 AP/encounter rule, and is consistent with the customer service answer.
When "specific trumps general" is a principle of the game's overall design, it's not really a strong argument in favor of a reading that it doesn't require the specific to trump the general. And given that customer servicers don't always agree with
each other, it makes little sense to think that they necessarily agree with the actual rules.
All this posting notwithstanding, I really am not trying to say that a player whose character has this power should get to spend two action points in one encounter. While I haven't seen it in play in contrast with other paragon paths to compare it against, it certainly smells of imbalance. I just wish people would be more willing to accept that they're interpreting a rule in a certain way to promote balance, rather than following the rule to the counterintuitive letter.
(Why do I care how some people on the internet run their games? **** if I know, but I haven't got anything better to do right now, so why not.

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