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Manifesting Time: 1 swift action
You boost your movements to super-naturally high levels, allowing you to strike at many targets in what others perceive as the blink of an eye. Your actions are so rapid that they leave visual echoes of your previous positions in the air as you move, although these quickly fade.
This round, as a full attack action, you may make a single ranged attack with one ranged weapon (or several thrown weapons of the same type) against each target within one range increment of your weapon, similar to the Whirlwind Attack feat. You still expend ammunition as normal for these attacks.
You may not make more attacks with barrage than your manifester level.
Barrage and Attack Rolls
Given the level at which barrage can be gained, it is possible to result in a player using it to make over a dozen attacks in one round. In the interest of game flow, it can be decided that the manifester makes a single attack roll (or one attack roll for a certain number of targets), rather than one attack roll per target. This can have the effect of drastically skewing the result of the power, as that one attack roll may be great, or it may be terrible, but it may help in terms of needing to make a massive number of attack rolls in a single turn.
Psionics Expanded: Advanced Psionics Guide. Copyright 2011, Dreamscarred Press; Authors: Jeremy Smith and Andreas Rönnqvist.